From Jan. 21, 1997 to Aug. 27, 1998, the strong earthquake swarm including 9 events of M_S 6 occurred in Jiashi, Xinjiang Uygur Autonomous Region. The focal mechanism solutions show that 9 events have both two nodes of NE and NW. In some people's opinions, the main rupture strike of the swarm is NNW direction. In this paper, through analysis on the precise location of aftershock sequences recorded by digital seismic array, focal rupture process and slipping directions, spatial distribution image of earthquake swarm, long-axis strikes of intensity isoseismal line, and dynamic change trends of micro-macro epicenters, the conclusion that main rupture strike is most likely NE direction is Obtained.