Special mechanism that laser weapon damages targets requires that electro-optical tracking system has higher accuracy.Aiming at this problem，a composite axis control system is proposed.Through the analysis of the tracking control technology on shipboard，the control model of composite axis tracking system is designed，and this system was simulated and verified by MATLAB.Simulation results show that the composite axis control technology makes the system tracking accuracy increases from 0.4 mrad to less than 4 μrad.