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采用Ｓｋｕｐｓｈｙ－Ｌｅｅ（Ｓ－Ｌ）球谐模分解方法，按一个简化的物理模型，对激光直接驱动聚变中不同束－靶条件下的靶面初始辐照不均匀度的均方根偏差进行了数值计算，由此分析了在光束完全对称排布的多光束辐照系统中，光束截面光强分布、聚焦透镜Ｆ数、离焦参数（靶心离焦距离与靶丸半径之比）、光束数这几个主要因素对辐照均匀性的影响。
The root mean square deviation (RMSE) of the initial irradiance of target under different beam-target conditions in laser direct-driven fusion was calculated by a simplified physical model using the Skupshy-Lee (S-L) spherical harmonic decomposition method The results show that the beam intensity distribution, the F number of the focusing lens, the defocusing parameter (the ratio of the defocusing distance to the radius of the shot), the number of light beams The main factors affecting the uniformity of radiation.