中文摘要：

本文对电性联合反演进行了深入研究,以减少地球物理反演的多解性。将直流电阻率（DC）与大地电磁（MT）数据加入到同一反演数据集中。引入Tikhonov正则化思想建立反演目标函数,使反演过程更加高效稳定。在解决正则化反演问题过程中,分别采用了二阶最大平滑稳定因子和改进的L-curve法,提高了反演结果的稳定性和正则化因子的求取精度;最后运用非线性共轭梯度法（NLCG）对反演目标函数实现最优化求解。经研究表明：联合反演方法与单一反演方法相比,能够更加有效的约束反演模型范围;反演算法快速稳定,提高了反演精度,减少了对地下地质结构认识的模糊性。

英文摘要：

In order to reduce the solutions of geophysical inversion,the joint inversion theory on dielectric properties were studied. The direct current resistivity（ DC） and magnetotelluric（ MT） data is added to the same inversion of data set. this paper introduces the idea of Tikhonov regularization establish the inversion objective function,which makes the inversion process more efficient and stable. In the process to solve the major problems of regularized inversion,We using the maximum smoothing stable second-order factor and improved L-curve method chosen regularization factor. To improve the stability of inversion result and improve the accuracy for the regularization factor; Finally,through the nonlinear conjugate gradient method（ NLCG） to realize the optimization of the objective function for solving inversion. By the test shows that the joint inversion inversion is more effective constraint model range than a single inversion method; The inversion algorithm is fast and stable,improve the inversion precision and reduce the fuzziness of understanding of underground structures.