断层的定量解释模型一般是一个无限延伸的二度体模型。但当断层的深度加大或断层延伸范围变小时，实际的模型与二度体模型的假设差别较大，致使反演结果误差较大，难以适应实际问题的需要。本文从六面体模型出发，将二度体模型修改为似二度体模型，建立了一个带约束的重力－垂直断层反演模型，经过理论模型试验证明效果要优于二度体模型的反演结果，在此基础上对美国内华达州的圣安德烈斯地区的布格重力异常资料做了定量解释。

Generally the quantitative interpretation of the fault uses a 2D model. But if the depth and extension of fault increase, the inversion results will have a bigger error because the 2d model is not fit the real fault. In this paper, we put forward a 2.5D model based on the hexahedron and an inversion method of constraint gravity-vertical fault. The inversion result is better than the 2D model through the model tests. Based on this model, we quantitatively interpreted the Bouguer gravity anomaly of the Sierra Nevada Region in USA.