Abstract: The iterative convergence of magnetic field integral equation(MFIE) solved by method of moment is fast. But the calculation accuracy of MFIE is inaccurate. The strong singularity of MFIE integral kernel was extracted and processed, and the residual mild singularity was eliminated by integral domain transform. Then MFIE can achieve good accuracy solved by method of moment (MoM). The calculation result of MFIE is in good agreement with electric field integral equation (EFIE) when calculating the radar cross section of the model, and the error is less than 0.5dB. It also proves that the convergence of MFIE is better than EFIE which proves the efficiency of the algorithm.