中文摘要：

通过对模型重力异常理论公式的研究，得到可计算局部模型重力异常的球近似公式，但是计算所用时间长，不能满足要求。因此将公式用泰勒公式展开，分别取至零阶项、一阶项和二阶项，比较三者的速度；并以严格公式所得结果为模型真值，比较三者的精度，得出了最优的实用模型重力异常公式。

英文摘要：

A fast algorithm was presented in the paper. Classical spherical approximation formula is able to be used to calculate model gravity anomaly by computers ; however, the speed of calculation is still away from demand. So, a new formula is needed to improve operating speed. Throuph spreading Taylor formula, getting access to zero- order term, one-order term and two-order term respectively, and comparing speed and accuracy of three methods＇ speed and their accuracy, an optimum practical algorithm for calculating model gravity anomalies is obtained.