Abstract：As China Geodetic Coordinate System 2000(CGCS2000) starts being used,the coordinate of surveying and mapping products need to be transformed and the method of coordinate transformation with high accuracy also need to be studied. Large residuals still remain after the transition by use of Bursa model from the astrogeodetic network of our country to highprecision geocentric coordinate system. In order to improve transformation accuracy,grid coordinate transformation is used to fit residuals further, in which covariance function and multiquadric function prediction model are respectively adopted to predict the coordinate correction of grid node. The experiment shows that the accuracies of these grid coordinate transformations on the two above prediction models are similar, so the two models are able to fit remaining residuals effectively. The residuals which remain after the whole transformation are in a low level and the high transformation accuracy is achieved.
