从朗伯余弦定律出发，理论推导了漫透射屏后接收面上任意点光强与入射光强的关系。结合漫透射屏在功率监测仪中的应用，通过数值仿真计算，理论上概括了单层和多层漫透射屏对入射光束光强分布的影响规律。数值计算表明：当入射光束半径、漫透射屏与接收屏的距离满足二者之比小于或等于0.3时，入射光束的光强分布、光束口径对接收面上光强归一化分布的影响可以忽略，且接收面上光强的归一化分布主要取决于漫透射屏与接收屏的距离，而与多层漫透射屏的排列方式、层数等参数基本无关，此结论得到了实验的证明。

On the basis of the Lambert’s cosine law, the light intensity of a point on the receiving screen behind the diffuse transmission glass screen was theoretically deduced. Combining the application of the diffuse transmission glass screen in the power monitor, the influence of both single-layer glass and multi-layer glasses on the intensity distribution of the incident laser was summarized through numerical simulation. The numerical results show that when the ratio of the radius of the incident laser to the distance from the diffuse transmission screen to the receiving screen is no more than 0.3, the intensity distribution and the caliber of the incident laser couldn’t influence the normalized light intensity distribution on the receiving screen. And the normalized light intensity distribution on the receiving screen mainly depends on the distance, which indicates that the arrangement of the glasses or the number of the layers almost have nothing to do with the distribution. This conclusion was proved by the experiment.