According to sparse feature of the matrix, we use Gauss-Sadel resolution method to solve such equations and use inner and outer iteration and multi-curent poles techniques to improve the quality of image of resistivity structures.

• 根据反演方程系数的稀疏特徵，采用改进的降维高斯赛德尔迭代法来求解该反演方程，并通过内外迭代的结合，对大型稀疏欠定方程能很快收敛，得到可靠的解答。