Abstract: The Jan.2, 1997 to Dec. 31, 1998 Jiashi earthquake swarm has greatly affected the nearby tectonic activity and fault slip behavior. In this paper, the observation data of MD model fault deformation monitoring system was used to calculate slip rate of the eastern segment of the Keping fault since 1994. The observation and calculation results show that both the horizontal and vertical slip rates changed obviously after the Jiashi earthquake swarm. The sense of the horizontal slip rate changed from rightlateral strikeslip before it to leftlateral slip after it, and the vertical slip rate was 2 times faster than the old one. The horizontal slip rate was 0.033 mm/a in sinistral sense before the Jiashi earthquake swarm, and 0.016 mm/a in dextral sense after it. The vertical slip rate increased from 0.037 mm/a before it to 0.069 mm/a after it. The stress field also changed after Jiashi earthquake swarm. Although the magnitude of strain rate here remained unchanged, the direction of the principle strain rate rotated 16.7° clockwise.