大地电磁测深研究中，长期以来使用视电阻率和相位作为解释参数，但视电阻率和相位均存在一定的局限性。
In MT, apparent resistivity and phase have been used as interpretative parameter for a long time. However, apparent resistivity and phase have some limitations.
为在电阻率测深曲线反演中得到全局最优解，采用先使用遗传算法再用最小二乘法反演方法，对较为复杂的3层和3层以上大地模型进行了计算，其模型参数误差只有6%。
It is shown from the computations that the joint method inherits both the advantages of GA and least square. The model errors of inverting 3 or more strata layered earth are 6% less.
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