Abstract:A new energy double redundancy system and its logic double threshold control strategy are proposed based on the low energy reliability phenomenon of the direct drainage servo system of Chinese Launch vehicle, which can realize energy switching and fault isolation automatically of the first and second oil circuit. And it has a simple structure and light weight. Moreover, the logic double threshold control strategy is optimized. The optimal double threshold valves are determined based on the first and second oil circuit switch working characteristics, which can improve the reliability of the double redundancy energy system greatly. The test results indicate the system structure is reliable and the control strategy is effective, which has no false switching phenomenon. It can improve the servo system reliability greatly and meet the high reliability requirements of Chinese manned space landing.