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In order to improve the precision alignment of laser beam in high power laser physics experiments, an open loop control system is proposed for attitude adjustment of laser raster and reflector, which is composed of the upper machine, the lower machine and the angular displacement adjustment mechanism. From the application layer communication protocol, HostLink (Fins) protocol and 3D pose simulation, the design of the upper computer monitoring software is introduced; From the step motor driver reuse, the phase memory of the PLC motor and the program block diagram of PLC,the design of the lower PLC control system is discussed. The realization principle is analyzed which high precision angle resolution is achieved by converting the linear micro displacement of the screw nut to the angular micro displacement in angular displacement adjustment mechanism. With the experimental data, the actual angular resolution is verified to meet the requirements of high precision. The results show that the open loop control system can achieve high precision adjustment control for the laser raster and reflector, and can also be used for other similar experiments.