The mean geopotential value of the global mean sea surface, 62 636 856.550 7 m2s-2, is determined based on the global gravity model(EIGEN-6C4、EGM2008) and global mean sea surface height model(DNSC08、DTU10、DTU13).The geoidal potential (62 636 858.179 0 m2s-2) can be obtained by subtracting the mean sea surface topography from the mean sea surface height. Then, 649 GPS/leveling data,distributed evenly over the mainland of China,are selected to calculate the 1985 national height datum geopotential and the vertical shift using three methods, combined with the global gravity model EGM2008. The vertical shift value is improved by weighting, and utilizing two methods to verify the rationality and correctness after weighting. The final results demonstrate that the 1985 national height datum is 0.298 0 and 0.464 2 m above the mean sea level and the global geoid, respectively.
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