Abstract: First, time series of baseline observation of GPS continuous sites in FuJian province is calculated by use of the GAMIT program, then, white noise and impulsive perturbation in the time series are removed using mathematical morphology filter.Then, taken main fault zone of FuJian as research background, the relationship between GPS baseline series, short leveling deformation observation data of crossfault sites and regional crustal motion in Fujian is studied.The influence of mail factors of the quality of the GPS baseline is analyzed, and the relationship between crustal movement and principal compression stress are obtained.