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In connection with the characteristics of high-resolution in gravity gradient��we used the data of measured vertical gravity gradient in Changbai Mountain area to inverse its deep structure by using gradient space plot�� The step models prove that the gradient space plots can give the information of the structural dip and pour surface�� Combined with gravity gradient profile��we can build a geometric model of the subsurface structure��and then explaine some of the complex structure�� Based on the measured Bouguer gravity anomaly and the measured gravity gradient anomaly contrast��the gravity gradient has higher resolution than gravity anomaly�� When the gradient method is applied in the measured gravity gradient data processing��the results show that the method to determine the density changes in the level of the interface position and depth has good effect��