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In order to achieve the small UAV automatic landing on UAV research project, an UAV automatic landing-vertical height control strategy was provided. According to the UAV flight mission requirements, the aircraft landing performance and aerodynamic model, the design of the straight line sliding trajectory was researched. Besides, an index leveled method has also been used to design the glide path. The PID control techniques has been used to design a reasonable vertical and pitch control loop model, as well as high control loop model. Some necessary performance analysis and critical parameters selection has been finished by MATLAB simulation. After completed the design of UAV control system, a principle simulation based on MATLAB and hard-in loop simulation based on FlightGear flying environment simulator validate the efficacy and practicability of the flight high control strategy. This can be as a reference for UAV high control loop design.