本文从重力场的基本理论出发,导出反映基岩起伏形态的密度界面函数。文中还研究了上覆沉积岩的密度随深度变化的规律,给出等效剩余密度公式。最后,给出由重力异常计算基岩深度的公式。用此法对白洋淀地区的重力异常进行了计算,其结果和实测曲线是吻合的。 Based on the basic theory of gravitational field, this paper derives the density interface function that reflects the rockfill morphology of bedrock. The paper also studied the law of the density of overlying sedimentary rocks with depth, and gave the equivalent residual density formula. Finally, a formula for calculating bedrock depth from gravity anomalies is given. This method was used to calculate the gravity anomalies in the Baiyangdian area. The results are consistent with the measured curves.