Abstract: The takeoff and landing control algorithm of rocket assisted UAV is studied in order to innovate a short takeoff and landing method for large high subsonic UAV. In the research process, the control strategy of rocket assisted UAV during takeoff and landing is designed; The mathematical models of UAV aerodynamic force, booster rocket force, engine thrust and control law are established; The dynamic equation of UAV takeoff and landing process is constructed; A control algorithm based on PID control is designed to control the take-off and landing process of the target UAV safely and stably under various interference environments. MATLAB software is used for programming and simulation. The simulation results show that the designed control algorithm and control rate meet the control requirements of the takeoff and landing process of the target UAV.