Abstract: The variety characteristics of the geoidal height are analyzed based on the information of the geodetic gravity measurement on station points by Bruns formula.The conclusions drawn obtained that the vertical deflection is the line correction about the geoidal inclination,the gravity anomaly is the line correction about the geoidal bending;and the topographic effects are the second order correction about the geoidal height variety.On the basis of these clews.The method for fitting geoidal height is put forward regarding for the gravity field information on the stations,and the superiority is compared with the method of the second order surface fitting.