In the course of the transform from spherical surface coordinates of radar's station to right-angle coordinates of the command center fulfilled by the earth-centered coordinate, when the rotation of the earth and the factor of topography and the function of the gravity are considered. The model of the earth and the level surface of the earth are not a one. The coordinate axis and the reality lies the vertical warp. On the base of the analysis of the above factor, a method of error mending is found, and the course of the computing is given, it has a great sense on the improving the precision of the transform and has a use for reference for the further research on the large scale of the distributed system.