A spot tracking closed-loop system for the control of a one-to-many laser communication net was introduced. On the basis of the closed-loop position of the servo rotary table, the closed-loop beam tracking system which takes a CCD camera as the sensor and a two-dimensional servo rotary table as the actuator was discussed particularly. The mathematical principle of the tracking system was introduced and static and dynamic errors of every link in the closed-loop beam system and the responses of open-loop and close-loop were researched also. After theoretical calculation and mathematical simulation , a closed-loop tracking programming was written. Then, a control algorithm combined the classical PID control and feedforward control was used to further improve the servo bandwidth and to guarantee the stability of the system. The tracking experiment on spot positions in laser communication was performed and the result shows that tracking error is 3σ≈136 μrad, which meets the demands of laser pointing in laser communication nets. The obtained results verify the feasibility of control strategy, and lay the foundation for the multiple beam servo.