把信息论应用于采样成像系统中 ,用互信息量评价图像捕捉部分的性能 ,做出基于信息论的系统评价仿真曲线 ,提出基于信息论的系统优化设计的指标。根据仿真结果 ,给出光学成像系统与CCD阵列探测器的宏观匹配特性与最佳匹配条件。图像捕捉实验结果证明了理论分析和仿真结论的正确性。 The information theory is applied to the sampling imaging system, the performance of the image capture part is evaluated by mutual information, and the simulation curve of the system evaluation is made based on information theory. The index of system optimization design based on information theory is proposed. According to the simulation results, the macroscopic matching characteristics and the best matching conditions between optical imaging system and CCD array detector are given. The experimental results of image capture prove the correctness of theoretical analysis and simulation results.