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对已知地质模型进行重力异常正演计算是利用重力场数据对地下介质的密度异常信息进行解释的重要手段。针对三维复杂地质体的建模困难且不便，而且多数三维线性地质体可以近似看作二维地质体以实现快速方便处理的情况，对二维地质体进行多边形网格建模，并利用Matlab平台编写了适用于复杂二维地质模型的重力异常计算的软件系统。该软件系统对模型设定简单、运算速度快。选择华北地区的剖面使用目前业内广为使用的IGMAS正演软件和文中的软件系统进行了对比试验，结果显示两种方法计算的重力异常结果相当。“,”Calculation of gravity anomaly from known geological model is an important method to interpret ab-normal density of medium by using gravity data.Modeling of 3-D geological body is difficult and inconvenient, and many 3-D linear geological bodies can be processed conveniently and fast as 2-D geological bodies.This paper built polygonal grid model of 2-D geological bodies and compiled software on Matlab platform to realize the calculation of gravity anomaly from complex 2-D model.The structure of the model is simple and the soft-ware executes fast.A comparative test with widely used calculation program IGMAS and the software in this pa-per is carried out using a profile in North China.The results show that the gravity anomalies calculated by the two softwares are almost identical.