Abstract: In this paper,we combine the Jones' Monte Carlo inversion method with revised Mar-quardt inversion to get the new Monte Carlo inversion method. The method has advantages of high calculation speed and high precision of solution. It is actually a combination of random solution and directive solution. The authors processed the theoretical apparent resistivity data and actual apparent resistivity data using the new Monte Carlo inversion program,and a large number of models with high fitting degree,therefore obtaining the range of solution.