利用应县～淄博地震测深解释的二维速度结构，并将速度值转换为密度值，提供初始基本模型。运用任意多边形截面的块状二度体模型计算重力异常值，反演二维块状密度分布。计算结果表明：上、中地壳之间的滑脱面是一较明显的密度界面；下地壳底部的强速度梯度层──壳幔过渡带是一高密度层；五台山下部中、下地壳内的低速度块体是低密度块体。 Using the two-dimensional velocity structure interpreted by sounding of Yixian-Zibo earthquake, the initial basic model is provided by converting the velocity value into the density value. The gravity anomaly value is calculated by using the block second body model with arbitrary polygon cross section, and the two-dimensional mass density distribution is inverted. The calculated results show that the slip surface between the upper and middle crust is a more obvious density interface, and the strong velocity gradient layer at the bottom of the lower crust-the crust-mantle transition zone is a high-density layer. The lower middle and lower crust in the lower part of Wutai Mountain Speed ​​blocks are low density blocks.