Abstract: The paper analyzes the crustal movement intensity and large spatial deformation of the Zhangjiakou-Bohai fault system using GPS data. The result shows that the Zhangjiakou-Bohai fault system is an obvious crustal movement intensity boundary between the Yanshan block and Huabei plain, and mostly left-lateral strike-slip. The spatial noises in the data have been weakened by least squares collocation and eleven faults are inversed by a spherical dislocation model. It is concluded that faults in the NW direction are mostly left-lateral strike-slip, but the activity of Cangdong faults in the NE direction is the strongest, and mostly dip slip. Compared to the period of 1999—2001, strike-slip in the period of 2001—2004 decreased slightly in the mid-west and west segment, and apparently increased in mid-east and east segment.

Key words: Zhangjiakou-Bohai fault system, Crustal movement, Fault slip, GPS