为精确求解散射问题,采用混合场积分方程(CFIE)、多层快速多极子算法(MLFMA)和共轭梯度算法(CG)的收敛技术。基于传统多层快速多级子算法,详细研究了二维拉格朗日插值节点数对计算精度的影响,并改进了插值方法,在不同的层采用不同的插值节点数 提出了在不同的层采用不同的精度控制来计算多级子模式数 分析了稀疏矩阵的对称性对内存使用的影响以及磁场积分方程对迭代初始值的选择。数值计算结果表明以上改进可较大幅度地提高计算精度和计算效率,同时降低内存使用,可满足复杂目标电磁散射计算要求。-Precise scattering problem solving, mixed field integral equation (CFIE), multilevel fast multipole algorithm (MLFMA) and conjugate gradient algorithm (CG) convergence technology. Based on the traditional multilevel fast multilevel sub-algorithm, a detailed study of the impact of the number of nodes on the two-dimensional Lagrange interpolation calculation accuracy, and improved interpolation method in different layers with different interpolation nodes　presented in a different layers with different precision control to calculate the number of multi-level sub-patterns　analysis of the symmetry of the sparse matrix effects on memory usage as well as the choice of the magnetic field integral equation iterative initial value. Numerical results show that these improvements can greatly improve the computational accuracy and efficiency while reducing memory usage, which can meet the requirements of complex electromagnetic scattering calculation.