We use slowness-azimuth station correction ( SASC) method to improve the location accuracy of the Wenchuan aftershocks recorded by Nagqu and Hotan seismic arrays． The results showed that the standard deviations of backazimuth and slowness errors of Wenchuan aftershocks recorded by Nagqu array decreased 32% and 58% respectively after correction． The numbers are 38% and 71% for Hotan array． After the correction，the location accuracy of Wenchuan aftershocks recorded by Nagqu array are all improved，for Hotan array，78% aftershocks were improved in slowness and 100% were improved in backazimuth．