Academy of Sciences, Changchun 130033, China ）In order to solve the problems such as tedious parameter debugging, difficult equipment installation and poor target applicability in the tracking performance test system of traditional photoelectric tracking equipment, an infield trajectory realization technology based on path planning of mechanical arm is studied. A more flexible and efficient tracking performance testing system is designed by planning the trajectory of the end of the six-degree-of-freedom mechanical arm. Firstly, the traditional test target system is analyzed, and the mathematical model of tracking performance test is defined. Then, a new technology scheme based on the six-degree-of-freedom mechanical arm is proposed, and the differences between the two schemes are analyzed. Through the coordinate transformation of the target trajectory, the terminal pose parameters suitable for the six-degree-of-freedom mechanical arm are obtained according to the traditional dynamic target trajectory, so as to realize the trajectory planning. Finally, the consistency between the proposed method and the traditional method is verified by numerical simulation. Simulation results show that the proposed method has the same tracking performance as the traditional method. Compared with traditional methods, the test system based on mechanical arm has more advantages in parameter adjustment, tool installation and target applicability, which can fully meet the requirements of photoelectric tracking equipment in the field tracking performance test.