Abstract: The Global Positioning System (GPS) has been widely used in survey and its relative areas in China since the end of 1980s.Several large-scale high precision GPS networks have been established since 1991.The integrating adjustment of these GPS networks has been finished.But the quantity of high precision GPS points is limited,so the crustal movement image of the surveyed GPS points is half-baked.For these reasons,for the first time we use hardy function interpolation to establish a largely-covered and valuable speed field model,with which the crustal movement imags are also obtained.