There occurred an of earthquake of Ms 6.8 in Bachu-Jiashi county, Xinjiang , on Feb.24, 2003. There are 7 strong aftershocks greater than Mw 5 till June 30th,2004, and aftershocks of the sequence are rich and stronger. The article calculates the change of static stress of Ms 6.8 mainshock, both mainshock and aftershocks on rupture surface of sequent mid-strong aftershocks. Considering epicenter location error, the article discusses the change of static stress of Ms 6.8 mainshock, both mainshock and mid-strong aftershocks in different aspects, and analyses quantitatively the relation between static stress change of Ms 6.8 sequence and fault type, and delay time and spatial range effected by static triggering model. It is reasonable to employ the focal mechanism solution and depth in Harvard CMT catalogue and Xinjiang results of location epicenter , and 7 mid-strong aftershocks occur all in the increasing There occurred an of earthquake of Ms 6.8 in Bachu-Jiashi county, Xinjiang , on Feb.24, 2003. There are 7 strong aftershocks greater than Mw 5 till June 30th,2004, and aftershocks of the sequence are rich and stronger. The article calculates the change of static stress of Ms 6.8 mainshock, both mainshock and aftershocks on rupture surface of sequent mid-strong aftershocks. Considering epicenter location error, the article discusses the change of static stress of Ms 6.8 mainshock, both mainshock and mid-strong aftershocks in different aspects, and analyses quantitatively the relation between static stress change of Ms 6.8 sequence and fault type, and delay time and spatial range effected by static triggering model. It is reasonable to employ the focal mechanism solution and depth in Harvard CMT catalogue and Xinjiang results of location epicenter , and 7 mid-strong aftershocks occur all in the increasing