Abstract: In order to utilize both of the two kinds of data reasonably,the displacements predicted from the geophysical model are employed as priori values and the GPS measurements are acted as updated information to implement the crustal deformation analysis.Because the geophysical predicted displacements and the geodetic measurements have different precision and different external reliability,we adopt Helmert variance component estimation to balance the effects from the two different types of data sets.A numerical example shows that the deformation analysis method proposed in this paper can improve the solution accuracy of deformation parameters.