Abstract: According to the topography\|isostatic theory, an isostatic\|geoid can be calculated; at the same time, the model\|geoid can be derived directly from earth's gravity field model. In this paper, the "remove\|restore" technique and multi\|quadratic function are used to interpolate the known GPS/leveling data. The experimental results show that the accuracy of simulated geoid by practical geophysical data is better than other geoids.