Abstract: In view of the complex target in high frequency electromagnetic scattering, by using the commercial CAD modeling software, the goal of the RCS calculation combined with PO, MEC algorithm is achieved. For the target edge diffraction calculation, a new modeling method is presented, which improves the computational efficiency. The computing results are in close agreement with the results of multilevel fast multipole method(MLFMM). Finally with a fighter model as an example, the goal of angle domain,frequency domain RCS calculation is achieved, and the application of RCS data in the target high resolution range profile is studied. Experimental results show that, this modeling method has some reference value for high-frequency electromagnetic scattering of complex targets RCS simulation.