Abstract: Based on the bi\|cubic Bessel spline function method, this paper inverts the present\|day crustal horizontal velocity field and deformation field in China continent by combining GPS velocities obtained by high\|precision GPS network adjustment, seismic moment tensor data and fault slip rates. By this velocity and deformation field model, this paper analyzes the necessity of crustal deformation correction for the geodetic network observations in the joint adjustment of geodetic network and GPS2000 network.