对于震中偏离台网情况下的地震定位，常规方法定位效果较差。“翻台法”有效地提高了其定位精度。从均匀地壳模型的走时方程组出发，分析了“翻台法”定位中方程组系数的变化特点，推导了选取最佳翻转台站的方法，并得出如下结论：（１）“翻台法”增加了原定位方程组的约束方程，翻台数与已知条件和所求参数个数有关，从理论上讲，翻转台数超过独立的约束方程数时对增加定位精度不再有意义；（２）考虑到具体的台网布局和台站资料质量，翻转不同台站对提高地震定位精度所起的作用大小各不相同，因而存在选取最佳翻转台站问题。 For the earthquake location in the case of epicenter deviated from the station network, the conventional method has poor positioning effect. “Turn over method” effectively improve its positioning accuracy. Based on the traveltime equations of homogeneous crustal model, the changing characteristics of the coefficient of equations in the “overturning method” positioning are analyzed and the method of selecting the best reversing station is derived. The conclusions are as follows: (1) "The constraint equation of the original positioning equations is added. The number of inversion stations is related to the known conditions and the number of parameters required. Theoretically, it is no longer meaningful to increase the positioning accuracy when the number of inversion sets exceeds the number of independent constraint equations. Taking into account the specific network layout and the quality of station data, the effect of turning over different stations on improving the accuracy of the earthquake location varies. Therefore, there exists the problem of selecting the best toggle station.