Abstract: Deformation of North China Region is very small, there is little discussion about whether GPS long-term crustal tectonic deformation can reflect the deformation of North China Region or not. In this paper the GPS velocity field of COMNOC-I was used to calculate the strain rate and its accuracy for North China using multiquadric-biharmonic method. Analysis of standard deviation, calculated by the law of error propagation, shows that these strain rate results are highly accuracy. And that the reliable results distribution was consistent with the measured data. The more measured point the higher the accuracy of the strain rate.