采用矢通量分裂法在网格加密后对电磁散射场和雷达散射截面积ＲＣＳ进行了检验．根据矢通量分裂法将特征值分解为正负两部分，每一部分抑制了各自的误差．目前计算ＲＣＳ大都采用频域方法，运用时域方法在实际网格下进行差分运算还较少见．计算结果与网格加密前的情况基本一致． Vector flux splitting method was used to test the electromagnetic scattering field and radar cross-section RCS after grid encryption. According to vector flux splitting method, the eigenvalue is decomposed into positive and negative parts, each part restrains its own error. At present, RCS is mostly used in the frequency domain method. It is still rare to use the time domain method to perform differential operation under the actual grid. The calculation results are basically the same as those before grid encryption.