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采用蒙特卡罗（Ｍｏｎｔｅ－Ｃａｒｌｏ）法对卫星ＣＣＤ相机的地气杂光进行了计算。主体段杂光系数的计算值与用积分球实验测量值属同一数量级，表明该方法和计算软件具有一定的可靠性；分析计算值与测量值产生偏差的因素发现，热物性参数的不确定性对数值模拟影响很大。分析了遮光罩长度、反光镜扫描角度等变化对杂光系数的影响，结果表明，遮光罩长度不变，而反光镜的扫描角度为４５°时，光线的进入比例最大，而杂光系数最小。
Monte Carlo method was used to calculate the stray light of satellite CCD camera. The calculated value of the straggle coefficient of the main body is the same order of magnitude as the experimental value of the integrating sphere, which shows that the method and the calculation software have some reliability. The analysis of the deviation of the calculated value from the measured value shows that the uncertainty of the thermal property parameter Great impact on numerical simulation. The influence of the change of the hood length and the mirror scanning angle on the stray light coefficient is analyzed. The results show that the length of the hood is constant. When the scanning angle of the mirror is 45 °, the light enters the largest proportion while the stray light coefficient is the smallest .