Abstract: Primary analysis of the processed GPS monitoring data in 2008 in North China suggests: ① The horizontal deformation field in North China (to the east of Shanxi fault zone) on the whole follows the movement mode of the last period (2004—2007), and differential movement related to the earthquake is not obvious several months before the Wenchuan M_S8.0 earthquake and in the coseismic period (several months after earthquake); ② Carefully observing the results deviating from the last period shows that the influence of Wenchuan Earthquake is mainly at the south part of Shanxi fault zone, and there appears a faintly dynamic movement in North China. In the northeast area there exists to some extent movement deviating from the background result, and the southeast and northwest regions have the evidence of accelerating. But from the point of information notability, the related discussion is mainly focused on possibility or evidence of deformation due to the low signal-to-noise ratio of the information.

Key words: Wenchuan earthquake, Horizontal deformation, Dynamic character, North China