Aiming at the problem of insufficient safety of landing under the traditional landing control strategy, carry out longitudinal control system design of secure landing for the certain type large load UAV. Based on reason analysis, design longitudinal control system and control structure of high safety landing according to target UAV feature and operation structure. Carry out simulation, comparison and analysis. The results show that the design can preserve landing accuracy, and greatly improve wind proof force of UAV, and effectively improve the ability of adapting to different environments and conditions.