主被动复合激光距离选通探测系统的最大作用距离包括可见光/红外系统的最远探测距离和激光系统最远成像距离，分别对其进行建模分析，建立函数表达式，分析了探测器灵敏度和发射功率、激光发射角及大气能见度对最大作用距离的影响，并搭建了532 nm YAG激光器和860 ns固体激光器两套距离选通实验系统，仿真分析系统最远作用距离分别为11.2 km和5.5 km，采用YAG激光器分别对15.7 km、10.9 km、13 km目标成像，采用固体激光器分别对1.3 km、5.1 km、6 km目标成像，通过对比验证了系统的最远距离，实验结果表明，理论计算的最远作用距离与实际最远作用距离基本相符，最远作用距离函数能够反映系统的实际性能，可以作为系统评价的基本参考，是系统设计的重要参考依据。

The maximum range of active and passive laser range-gated detection system consists of the most far detection range of the visible/infrared system and the laser system. The furthest distance function of visible/infrared detector and the laser imaging were established respectively. The influence of the detector sensitivity, the transmission power, the laser emission angle and the atmospheric visibility on the maximum range was simulated. Two sets of range-gated system of 532 nm YAG laser and 860 nm solid-state laser were established. Simulation analysis system farthest distance is 11.2 km and 5.5 km respectively. 15.7 km, 10.9 km and 13 km targets are imaged using YAG laser. 1.3 km, 5.1 km and 6 km targets are imaged using solid-state laser. The most remote of the system is verified by comparing the distance between the targets. The experimental results show that the furthest distance from the theoretical calculation is basically consistent with the actual distance. The furthest distance function can reflect the actual performance of the system. It can be used as the basic reference for the evaluation of the system and it is an important reference for the design of the system.