三维可控源电磁高精度、高效的正演模拟是其资料解释的基础，也是认识复杂地质结构响应特征的必要途径。而当前三维正演面临精度差、效率低以及内存消耗大等问题，因此寻求快速、高精度的3D CSEM正演算法是地电感应领域的研究热点。本项目拟采用Coulomb规范A-φ势电磁系统、非结构化网格、局部加密技术以及电流密度法向连续的高阶自适应有限元技术来解决三维正演面临的技术问题。Coulomb规范A-φ势电磁系统能给出稳定的有限元系统，提高有限元系统的求解效率；非结构化网格能有效逼近复杂地形以及地质单元，降低网格离散不准引起的系统误差；局部加密技术能有效降低场源奇异性，从而降低源项引入的误差；高阶自适应有限元技术避免网格单元不断细化带来的内存消耗大、求解耗时长等技术缺陷，既有指数收敛特征，又保证了精度，以及进一步减少计算消耗。最后，采用标准模型验证算法正确性，辅助实际资料解释，为下一步开展反演奠定基础。

High-precision and efficient 3D forward modeling technology of CSEM is the basis of CSEM data interpretation, and a necessary way to understand the respone characteristics of complex geological structures. Therefore, the rapid and high-precision 3D CSEM forward algorithm to simulate the response characteristics of complex geological structures has always been a hot and difficult topic in the field of geo-elctromagnetic induction. This project is intended to solve this problem by the vector and scalar potential finite-element system based on Coulomb gauge, unstructured mesh, local refinement technology, and high-order adaptive finite element technology. The finite-element electromagnetic system is very stable using vector and scalar potential based on Coulomb gauge. The unstructured grids can effectively approximate complex terrain and geilogical structured, which reducing system error of the inaccurate dispresion of the geoelectric models. and local refinement strategy can effeectively redure the singularity of the field source, which improve the accuracy of forward modeling. High-order adaptive finite element technology can avoid the problem of the high memory consumption and long-running times , which have exponential convergence characteristics. Finally, after benchmark our algorithm, we will apply our 3D CSEM forward modeling code to solve the practical CSEM data analysis. In the futher, we will develop new generation CSEM inversion code for CSEM probelm.