为了满足微光夜视仪室内性能测试的需求，对晴朗夜空满月光光谱和无月时星光光谱进行模拟.首先，对夜视仪的工作光谱范围进行研究，确定需要拟合的光谱波段.接着，对该波段的夜天光谱进行分析，选取合适的光源.采用简单夜天光谱拟合方法，根据目标光谱和光源光谱，得出所需的滤光片衰减曲线，找出该曲线近似对应的滤光片.提出基于遗传算法的光谱构造方法，根据光谱构造理论，采用现有的47种滤光片进行光谱构造，通过遗传算法求解该光谱构造函数，计算出不同滤光片的最佳匹配模式，并进行模拟.实验结果表明，采用基于遗传算法的光谱构造方法对夜天光谱拟合得到的光谱匹配度更高.

In order to satisfy the needs of testing the performance of the low-light level night vision device indoor, the spectrums of sunny sky full moon and clear night sky stars were simulated. First of all, the spectral range of low-light level night vision device was studied to make sure the spectral bands. Then the night sky radiation was analyzed for the spectrum bands, the appropriate light source was selected.The filter transmittance curves was got by calculating target spectral and source spectrum, andthe filter complied with the condition approximately was found out. Spectral structure based on genetic algorithm was proposed to calculate the best match model of the 47 existing kinds of filter to fit the spectrum. The experimental results show that the spectral structure technique based on genetic algorithm for night sky spectral fitting is higher compatibility.