WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.01AR1
Distribution Date: 12/26/2003

Class	Cusip	Orig Prin Bal	Begin Prin Bal	Int Rate Accrued	Int Rate Paid	Int Dist	Prin Dist	Int Shortfall	Prin Loss	Deferred Interest	Int Reimbursed	Unscheduled Int	Prin Reimbursed	Subsequent Recoveries	Total Dist	Ending Class Bal
IA1	929227AZ9	$197,000,000.00	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IA2	929227BA3	$124,000,000.00	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IA3	929227BB1	$61,609,000.00	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IA4	929227BC9	$153,750,000.00	$20,597,646.39	5.9110000000%	5.9110000000%	$101,460.57	$2,718,784.37	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$2,820,244.94	$17,878,862.02
IIA1	929227BD7	$74,000,000.00	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIA2	929227BE5	$53,635,000.00	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIA3	929227BF2	$51,250,000.00	$6,473,535.65	5.1520000000%	5.1520000000%	$27,793.05	$562,866.97	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$590,660.02	$5,910,668.68
B1	929227BG0	$10,005,000.00	$3,250,251.63	6.1226547167%	6.1226547167%	$16,583.47	$169,261.76	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$185,845.24	$3,080,989.87
B2	929227BH8	$6,670,000.00	$2,166,834.42	6.1226547167%	6.1226547167%	$11,055.65	$112,841.17	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$123,896.82	$2,053,993.25
B3	929227BJ4	$4,075,000.00	$1,323,815.64	6.1226547167%	6.1226547167%	$6,754.39	$68,939.70	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$75,694.09	$1,254,875.94
B4	929227BK1	$1,852,000.00	$601,645.78	6.1226547167%	6.1226547167%	$3,069.72	$31,331.61	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$34,401.34	$570,314.17
B5	929227BL9	$1,111,000.00	$360,922.49	6.1226547167%	6.1226547167%	$1,841.50	$18,795.58	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$20,637.09	$342,126.91
B6	929227BM7	$2,228,806.00	$724,055.11	6.1226547167%	6.1226547167%	$3,694.28	$37,706.24	$0.00	$0.01	$0.00	$0.00	$0.00	$0.00	$0.00	$41,400.53	$686,348.86
R	929227BN5	$100.00	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
R_SYN	XXXXXXXXX	$0.00	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
SFEE_GRP1	XXXXXXXXX	$0.00	$0.00	0.0000000000%	0.0000000000%	$5,395.53	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$5,395.53	$0.00
SFEE_GRP2	XXXXXXXXX	$0.00	$0.00	0.0000000000%	0.0000000000%	$3,663.12	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$3,663.12	$0.00
Total		$741,185,906.00	$35,498,707.11			$181,311.29	$3,720,527.41	$0.00	$0.01	$0.00	$0.00	$0.00	$0.00	$0.00	$3,901,838.70	$31,778,179.69

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.01AR1
Distribution Date: 12/26/2003

Class	Orig Face	Beg Bal	Prin Loss	Prin Reimbursed	Subsequent Recoveries	Deferred Interest	Total Prin	End Cert Pct	End Cert Bal
IA1	$197,000,000.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IA2	$124,000,000.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IA3	$61,609,000.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IA4	$153,750,000.00	$20,597,646.39	$0.00	$0.00	$0.00	$0.00	$2,718,784.37	0.1162852814	$17,878,862.02
IIA1	$74,000,000.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIA2	$53,635,000.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIA3	$51,250,000.00	$6,473,535.65	$0.00	$0.00	$0.00	$0.00	$562,866.97	0.1153301206	$5,910,668.68
B1	$10,005,000.00	$3,250,251.63	$0.00	$0.00	$0.00	$0.00	$169,261.76	0.3079450145	$3,080,989.87
B2	$6,670,000.00	$2,166,834.42	$0.00	$0.00	$0.00	$0.00	$112,841.17	0.3079450150	$2,053,993.25
B3	$4,075,000.00	$1,323,815.64	$0.00	$0.00	$0.00	$0.00	$68,939.70	0.3079450160	$1,254,875.94
B4	$1,852,000.00	$601,645.78	$0.00	$0.00	$0.00	$0.00	$31,331.61	0.3079450162	$570,314.17
B5	$1,111,000.00	$360,922.49	$0.00	$0.00	$0.00	$0.00	$18,795.58	0.3079450135	$342,126.91
B6	$2,228,806.00	$724,055.11	$0.01	$0.00	$0.00	$0.00	$37,706.24	0.3079446394	$686,348.86
R	$100.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
R_SYN	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
SFEE_GRP1	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
SFEE_GRP2	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
Total	$741,185,906.00	$35,498,707.11	$0.01	$0.00	$0.00	$0.00	$3,720,527.41	0.0428747760	$31,778,179.69

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.01AR1
Distribution Date: 12/26/2003
PER $1000 DENOMINATION
Class	Orig Face	Beg Bal	Prin Loss	Prin Reimbursed	Subsequent Recoveries	Deferred Interest	Total Prin	End Cert Pct	End Cert Bal
IA1	$197,000,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IA2	$124,000,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IA3	$61,609,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IA4	$153,750,000.00	133.96843180	0.00000000	0.00000000	0.00000000	0.00000000	17.68315037	0.1162852814	116.28528143
IIA1	$74,000,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIA2	$53,635,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIA3	$51,250,000.00	126.31289073	0.00000000	0.00000000	0.00000000	0.00000000	10.98277015	0.1153301206	115.33012059
B1	$10,005,000.00	324.86273163	0.00000000	0.00000000	0.00000000	0.00000000	16.91771714	0.3079450145	307.94501449
B2	$6,670,000.00	324.86273163	0.00000000	0.00000000	0.00000000	0.00000000	16.91771664	0.3079450150	307.94501499
B3	$4,075,000.00	324.86273374	0.00000000	0.00000000	0.00000000	0.00000000	16.91771779	0.3079450160	307.94501595
B4	$1,852,000.00	324.86273218	0.00000000	0.00000000	0.00000000	0.00000000	16.91771598	0.3079450162	307.94501620
B5	$1,111,000.00	324.86272727	0.00000000	0.00000000	0.00000000	0.00000000	16.91771377	0.3079450135	307.94501350
B6	$2,228,806.00	324.86232988	0.00000449	0.00000000	0.00000000	0.00000000	16.91768597	0.3079446394	307.94463942
R	$100.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
R_SYN	$0.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
SFEE_GRP1	$0.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
SFEE_GRP2	$0.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.01AR1
Distribution Date: 12/26/2003

Class	Orig Face	Int Rate Accrued	Int Rate Paid	Beg Cert Prin/Not Bal	Curent Int Accrued	Int Shortfall	Unscheduled Int	Int Reimbursed	Total Int Dist
IA1	$197,000,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IA2	$124,000,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IA3	$61,609,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IA4	$153,750,000.00	5.9110000000%	5.9110000000%	$20,597,646.39	$101,460.57	$0.00	$0.00	$0.00	$101,460.57
IIA1	$74,000,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIA2	$53,635,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIA3	$51,250,000.00	5.1520000000%	5.1520000000%	$6,473,535.65	$27,793.05	$0.00	$0.00	$0.00	$27,793.05
B1	$10,005,000.00	6.1226547167%	6.1226547167%	$3,250,251.63	$16,583.47	$0.00	$0.00	$0.00	$16,583.47
B2	$6,670,000.00	6.1226547167%	6.1226547167%	$2,166,834.42	$11,055.65	$0.00	$0.00	$0.00	$11,055.65
B3	$4,075,000.00	6.1226547167%	6.1226547167%	$1,323,815.64	$6,754.39	$0.00	$0.00	$0.00	$6,754.39
B4	$1,852,000.00	6.1226547167%	6.1226547167%	$601,645.78	$3,069.72	$0.00	$0.00	$0.00	$3,069.72
B5	$1,111,000.00	6.1226547167%	6.1226547167%	$360,922.49	$1,841.50	$0.00	$0.00	$0.00	$1,841.50
B6	$2,228,806.00	6.1226547167%	6.1226547167%	$724,055.11	$3,694.28	$0.00	$0.00	$0.00	$3,694.28
R	$100.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
R_SYN	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
SFEE_GRP1	$0.00	0.0000000000%	0.0000000000%	$0.00	$5,395.53	$0.00	$0.00	$0.00	$5,395.53
SFEE_GRP2	$0.00	0.0000000000%	0.0000000000%	$0.00	$3,663.12	$0.00	$0.00	$0.00	$3,663.12
Total	$741,185,906.00			$35,498,707.11	$181,311.29	$0.00	$0.00	$0.00	$181,311.29

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.01AR1
Distribution Date: 12/26/2003
PER $1000 DENOMINATION
Class	Orig Face	Int Rate Accrued	Int Rate Paid	Beg Cert Prin/Not Bal	Curent Int Accrued	Int Shortfall	Unscheduled Int	Int Reimbursed	Total Int Dist
IA1	$197,000,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IA2	$124,000,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IA3	$61,609,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IA4	$153,750,000.00	5.9110000000%	5.9110000000%	133.96843180	0.65990615	0.00000000	0.00000000	0.00000000	0.65990615
IIA1	$74,000,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIA2	$53,635,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIA3	$51,250,000.00	5.1520000000%	5.1520000000%	126.31289073	0.54230341	0.00000000	0.00000000	0.00000000	0.54230341
B1	$10,005,000.00	6.1226547167%	6.1226547167%	324.86273163	1.65751824	0.00000000	0.00000000	0.00000000	1.65751824
B2	$6,670,000.00	6.1226547167%	6.1226547167%	324.86273163	1.65751874	0.00000000	0.00000000	0.00000000	1.65751874
B3	$4,075,000.00	6.1226547167%	6.1226547167%	324.86273374	1.65751902	0.00000000	0.00000000	0.00000000	1.65751902
B4	$1,852,000.00	6.1226547167%	6.1226547167%	324.86273218	1.65751620	0.00000000	0.00000000	0.00000000	1.65751620
B5	$1,111,000.00	6.1226547167%	6.1226547167%	324.86272727	1.65751575	0.00000000	0.00000000	0.00000000	1.65751575
B6	$2,228,806.00	6.1226547167%	6.1226547167%	324.86232988	1.65751528	0.00000000	0.00000000	0.00000000	1.65751528
R	$100.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
R_SYN	$0.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
SFEE_GRP1	$0.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
SFEE_GRP2	$0.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
12/2003 DISTRIBUTION REPORT
SERIES: WAMU 01AR1
WEIGHTED AVERAGE PC RATE: 6.12906%
WEIGHTED AVERAGE MATURITY: 306.79320
WEIGHTED AVERAGE LOAN AGE: 29.09672
POOL NUMBER: Group 1(1762,1763)
ISSUE DATE: 08/24/2001
CERTIFICATE BALANCE AT ISSUE: $741,185,905.00
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
BALANCES FROM LAST FISCAL MONTH-END:	85		$35,498,707.12
PRINCIPAL POOL COLLECTION(S):
Scheduled Principal Collection Due Current Month		$32,497.38
Unscheduled Principal Collection/Reversals		$577.81
Liquidations-in-full	8	$3,687,452.24
Subsequent Recoveries		$0.00
Net principal Distributed		$3,720,527.43	-$3,720,527.43

CAPITAL LOSS (PRINCIPAL WRITTEN OFF):			$0.00

BALANCE CURRENT FISCAL MONTH-END:	77		$31,778,179.69

SCHEDULED INTEREST AT MORTGAGE RATE:		$204,977.13

UNSCHEDULED INTEREST AT MORTGAGE RATE:
Unscheduled Interest Collection/Reversals		$0.00
Interest Uncollected on Liquidation		$0.00
Interest Uncollected on Non-Earning Assets		$0.00
Net Unscheduled Interest Distributed		$0.00

OTHER:
Loan Conversion Fees		$0.00
Expense Reimbursements		$0.00
Gain on Liquidations		$0.00
Hazard Insurance Premium Refunds		$0.00
Recoveries Carried Forward		$0.00
Net Other Distributions		$0.00

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
12/2003 DISTRIBUTION REPORT
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
SCHEDULED SERVICING FEE EXPENSES:		$23,665.86

UNSCHEDULED SERVICING FEES:
Unscheduled Service Fee Collections/Reversals		$0.00
Servicing Fees Uncollected on Liquidation		$0.00
Servicing Fees Uncollected/Non-Earning Assets		$0.00
Net Unscheduled Service Fees Distributed		$0.00

MISCELLANEOUS EXPENSES:		$0.00

NET FUNDS DISTRIBUTED:		$3,901,838.70

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
12/2003 DISTRIBUTION REPORT
SERIES: WAMU 01AR1
WEIGHTED AVERAGE PC RATE: 6.22534%
WEIGHTED AVERAGE MATURITY: 298.79665
WEIGHTED AVERAGE LOAN AGE: 29.06812
POOL NUMBER: 1762
ISSUE DATE: 08/24/2001
CERTIFICATE BALANCE AT ISSUE: $555,812,549.00
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
BALANCES FROM LAST FISCAL MONTH-END:	64		$26,830,460.76
PRINCIPAL POOL COLLECTION(S):
Scheduled Principal Collection Due Current Month		$23,287.26
Unscheduled Principal Collection/Reversals		$577.41
Liquidations-in-full	6	$3,052,211.59
Subsequent Recoveries		$0.00
Net principal Distributed		$3,076,076.26	-$3,076,076.26

CAPITAL LOSS (PRINCIPAL WRITTEN OFF):			$0.00

BALANCE CURRENT FISCAL MONTH-END:	58		$23,754,384.50

SCHEDULED INTEREST AT MORTGAGE RATE:		$157,077.55

UNSCHEDULED INTEREST AT MORTGAGE RATE:
Unscheduled Interest Collection/Reversals		$0.00
Interest Uncollected on Liquidation		$0.00
Interest Uncollected on Non-Earning Assets		$0.00
Net Unscheduled Interest Distributed		$0.00

OTHER:
Loan Conversion Fees		$0.00
Expense Reimbursements		$0.00
Gain on Liquidations		$0.00
Hazard Insurance Premium Refunds		$0.00
Recoveries Carried Forward		$0.00
Net Other Distributions		$0.00

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
12/2003 DISTRIBUTION REPORT
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
SCHEDULED SERVICING FEE EXPENSES:		$17,886.97

UNSCHEDULED SERVICING FEES:
Unscheduled Service Fee Collections/Reversals		$0.00
Servicing Fees Uncollected on Liquidation		$0.00
Servicing Fees Uncollected/Non-Earning Assets		$0.00
Net Unscheduled Service Fees Distributed		$0.00

MISCELLANEOUS EXPENSES:		$0.00

NET FUNDS DISTRIBUTED:		$3,215,266.84

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
12/2003 DISTRIBUTION REPORT
SERIES: WAMU 01AR1
WEIGHTED AVERAGE PC RATE: 5.83104%
WEIGHTED AVERAGE MATURITY: 330.46691
WEIGHTED AVERAGE LOAN AGE: 29.18139
POOL NUMBER: 1763
ISSUE DATE: 08/24/2001
CERTIFICATE BALANCE AT ISSUE: $185,373,356.00
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
BALANCES FROM LAST FISCAL MONTH-END:	21		$8,668,246.36
PRINCIPAL POOL COLLECTION(S):
Scheduled Principal Collection Due Current Month		$9,210.12
Unscheduled Principal Collection/Reversals		$0.40
Liquidations-in-full	2	$635,240.65
Subsequent Recoveries		$0.00
Net principal Distributed		$644,451.17	-$644,451.17

CAPITAL LOSS (PRINCIPAL WRITTEN OFF):			$0.00

BALANCE CURRENT FISCAL MONTH-END:	19		$8,023,795.19

SCHEDULED INTEREST AT MORTGAGE RATE:		$47,899.58

UNSCHEDULED INTEREST AT MORTGAGE RATE:
Unscheduled Interest Collection/Reversals		$0.00
Interest Uncollected on Liquidation		$0.00
Interest Uncollected on Non-Earning Assets		$0.00
Net Unscheduled Interest Distributed		$0.00

OTHER:
Loan Conversion Fees		$0.00
Expense Reimbursements		$0.00
Gain on Liquidations		$0.00
Hazard Insurance Premium Refunds		$0.00
Recoveries Carried Forward		$0.00
Net Other Distributions		$0.00

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
12/2003 DISTRIBUTION REPORT
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
SCHEDULED SERVICING FEE EXPENSES:		$5,778.89

UNSCHEDULED SERVICING FEES:
Unscheduled Service Fee Collections/Reversals		$0.00
Servicing Fees Uncollected on Liquidation		$0.00
Servicing Fees Uncollected/Non-Earning Assets		$0.00
Net Unscheduled Service Fees Distributed		$0.00

MISCELLANEOUS EXPENSES:		$0.00

NET FUNDS DISTRIBUTED:		$686,571.86

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
12/2003 DISTRIBUTION REPORT
SERIES: WAMU 01AR1
WEIGHTED AVERAGE PC RATE: 6.12906%
WEIGHTED AVERAGE MATURITY: 306.79320
WEIGHTED AVERAGE LOAN AGE: 29.09672
POOL NUMBER: ALL
ISSUE DATE: 08/24/2001
CERTIFICATE BALANCE AT ISSUE: $741,185,905.00
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
BALANCES FROM LAST FISCAL MONTH-END:	85		$35,498,707.12
PRINCIPAL POOL COLLECTION(S):
Scheduled Principal Collection Due Current Month		$32,497.38
Unscheduled Principal Collection/Reversals		$577.81
Liquidations-in-full	8	$3,687,452.24
Subsequent Recoveries		$0.00
Net principal Distributed		$3,720,527.43	-$3,720,527.43

CAPITAL LOSS (PRINCIPAL WRITTEN OFF):			$0.00

BALANCE CURRENT FISCAL MONTH-END:	77		$31,778,179.69

SCHEDULED INTEREST AT MORTGAGE RATE:		$204,977.13

UNSCHEDULED INTEREST AT MORTGAGE RATE:
Unscheduled Interest Collection/Reversals		$0.00
Interest Uncollected on Liquidation		$0.00
Interest Uncollected on Non-Earning Assets		$0.00
Net Unscheduled Interest Distributed		$0.00

OTHER:
Loan Conversion Fees		$0.00
Expense Reimbursements		$0.00
Gain on Liquidations		$0.00
Hazard Insurance Premium Refunds		$0.00
Recoveries Carried Forward		$0.00
Net Other Distributions		$0.00

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
12/2003 DISTRIBUTION REPORT
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
SCHEDULED SERVICING FEE EXPENSES:		$23,665.86

UNSCHEDULED SERVICING FEES:
Unscheduled Service Fee Collections/Reversals		$0.00
Servicing Fees Uncollected on Liquidation		$0.00
Servicing Fees Uncollected/Non-Earning Assets		$0.00
Net Unscheduled Service Fees Distributed		$0.00

MISCELLANEOUS EXPENSES:		$0.00

NET FUNDS DISTRIBUTED:		$3,901,838.70

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.01AR1
Distribution Date: 12/26/2003

Distribution by Group
Pool ID		Principal		Interest		Total
Group 1(1762,1763)		$3,720,527.43		$181,311.27		$3,901,838.70
Pool - 1762		$3,076,076.26		$139,190.58		$3,215,266.84
Pool - 1763		$644,451.17		$42,120.69		$686,571.86
Aggregate		$3,720,527.43		$181,311.27		$3,901,838.70

Number of Loans and Aggregate Principal Balance By Group
Pool ID	Beg Bal	Beg Count	Paid Off / Liq Count	Rem Count	Sched Prin End Bal	Sched Prin	Prin PrePay / Liq	Unsched Prin / Rev	Total Prin
Group 1(1762,1763)	$35,498,707.12	85	8	77	$31,778,179.69	$32,497.38	$3,687,452.24	$577.81	$3,720,527.43
Pool - 1762	$26,830,460.76	64	6	58	$23,754,384.50	$23,287.26	$3,052,211.59	$577.41	$3,076,076.26
Pool - 1763	$8,668,246.36	21	2	19	$8,023,795.19	$9,210.12	$635,240.65	$0.40	$644,451.17
Aggregate	$35,498,707.12	85	8	77	$31,778,179.69	$32,497.38	$3,687,452.24	$577.81	$3,720,527.43

Delinquency Information by Group
Pool ID	1 Month Count	Sched End Balance	2 Months Count	Sched End Balance	3 Months Count	Sched End Balance	4 Months Count	Sched End Balance
Group 1(1762,1763)	0	$0.00	0	$0.00	0	$0.00	0	$0.00
Pool - 1762	0	$0.00	0	$0.00	0	$0.00	0	$0.00
Pool - 1763	0	$0.00	0	$0.00	0	$0.00	0	$0.00
Aggregate	0	$0.00	0	$0.00	0	$0.00	0	$0.00

Foreclosure and REO Information by Group
Pool ID		Foreclosure Count		Sched End Balance		REO Count		Sched End Balance
Group 1(1762,1763)		0		$0.00		1		$272,196.73
Pool - 1762		0		$0.00		1		$272,196.73
Pool - 1763		0		$0.00		0		$0.00
Aggregate		0		$0.00		1		$272,196.73

Aggregate Loss Amounts by Group
Pool ID			Count			Loss Amount
Group 1(1762,1763)			0			$0.00
Aggregate			0			$0.00

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.01AR1
Distribution Date: 12/26/2003

INSURANCE RESERVES - Group 1(1762,1763)
Insurance Type	Original Balance	Claims In Progress	Claims Paid	Coverage Adjustments	Coverage Remaining
MPI	$0.00	$0.00	$0.00	$0.00	$0.00
Special Hazard	$8,382,764.00	$0.00	$0.00	$0.00	$8,382,764.00
Bankruptcy Bond
Single-Units	$152,088.00	$0.00	$0.00	$0.00	$152,088.00
Multi-Units	$0.00	$0.00	$0.00	$0.00	$0.00
Mortgage Repurchase	$14,823,718.00	$0.00	$0.00	$0.00	$14,823,718.00

INSURANCE RESERVES - Aggregate
Insurance Type	Original Balance	Claims In Progress	Claims Paid	Coverage Adjustments	Coverage Remaining
MPI	$0.00	$0.00	$0.00	$0.00	$0.00
Special Hazard	$8,382,764.00	$0.00	$0.00	$0.00	$8,382,764.00
Bankruptcy Bond
Single-Units	$152,088.00	$0.00	$0.00	$0.00	$152,088.00
Multi-Units	$0.00	$0.00	$0.00	$0.00	$0.00
Mortgage Repurchase	$14,823,718.00	$0.00	$0.00	$0.00	$14,823,718.00

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.01AR1
Distribution Date: 12/26/2003

The Class Principal Balances of each Class of the Class B1,B2,B3,B4,B5,B6 Certificatesimmediately after the principal and interest distribution on 200312 are as follows:

Class			Class Principal Balance
B1			$3,080,989.87
B2			$2,053,993.25
B3			$1,254,875.94
B4			$570,314.17
B5			$342,126.91
B6			$686,348.86
Total			$7,988,648.99
Capitalized items used but not defined herein have the meanings ascribed to them in the Prospectus Supplement.

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.01AR1
Distribution Date: 12/26/2003

Aggregate ARM Information by Group
Pool ID	Netwac	Margin
Group 1(1762,1763)	6.12906%	1.94847%
Pool - 1762	6.22534%	1.94795%
Pool - 1763	5.83104%	1.95000%
Aggregate	6.12906%	1.94863%

WAMU MOR PASS THRU CERT SER 2001-AR1 8-K