As to modeling, model verification and application analysis of the space optical remote sensing system, in this paper, based on imaging mechanism of optical remote sensing, the imaging chain is first divided into three chains, which are signal chain, modulation transfer chain and noise chain, and then models of modulation transfer function and signal to noise ratio are built. Link by link and systemic verification has been carried out to confirm the accuracy of the simulation model. Models for different part of the chain are validated based on commercial design software, handbook and test data from the lab and so on. Systemic verification is executed by comparing simulation results with the in-orbit images. The verified results show that the systemic accuracy of model for modulation transfer function is better than 80% and that for signal is better than 85%. Finally, simulation analysis of in-orbit parameters adjustment is done and strategy of gain adjustment for different seasons and regions is put forward.%针对空间光学遥感系统全链路仿真中的建模、验模和应用分析的问题，文章依据光学遥感成像机制，将遥感成像链路分为信号链路、传递链路和噪声链路，分别建立了调制传递函数模型和信噪比模型。利用分环节验证和系统精度验证相结合的方法验证模型精度，基于商业设计软件、手册、实验室测试数据等不同形式进行分环节验证，基于仿真数据与在轨成像数据对比来实现系统精度验证。验证结果表明，调制传递函数全链路模型精度优于80%，信号模型精度优于82%。依据验证后的成像仿真模型，开展在轨成像参数调整仿真分析，针对不同季节、不同区域的成像提出在轨增益调整策略。
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