设计了一种三方向激光分束及高精度指向调节系统，适用于钠荧光多普勒激光雷达高精度的激光光束方向指向控制，以便激光雷达在长距离观测的情况下实现信号的迅速、精确获取。根据光学系统的设计要求，阐述了用于高脉冲能量分束镜、反射镜的光学物理特性以及控制反射镜负载、方向应有的机械特性；采用6个高精度的步进电机结合6个高精度光学二维调节镜架能实现1.18°的角度行程，调节精度可达1.1'，且重复定位成功率达99.3%，实验结果满足高能激光发射系统对控制反射镜的精度要求；测试分束后的激光能量损失为11.6%，满足钠荧光多普勒激光雷达的激光能量发射要求。并编写了一套用于激光雷达分束及高精度指向调节系统的控制软件，实现了系统的远程自动化控制。

A three-directional laser beam splitting system with high precision pointing adjustment iwas developed， including its hardware and software. This laser beam pointing control of sodium fluorescent Doppler lidar facilitated obtaining quick and accurate signals for long distance observation. Based on the design requirements of the optical system， the physical and mechanical characteristics of the beam splitter and reflector were presented. An angular stroke of 1.18° can be achieved using six high-precision stepper motors combined with six high-precision optical 2-D adjusting frames， with an adjustment precision of 1.1'， and the success rate of repeated positioning is 99.3%. The experimental results meet the precision requirements of the high energy laser emitting system. According to the performance requirements of the system， the laser energy loss is 11.6% after the beam splitter， which meets the laser energy emission requirements of sodium fluorescent Doppler lidar. A set of control software for the system was written to support remote automatic control of the laser lidar.