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flight test launch of new models in the development process as a step by step evaluation of the pilot project is widely applied, separation and detection as a key step of flight test , directly related to the success of the test, so the separation system proposed high reliability requirements, paper focuses on separation institutional, topology logic design and signal detection equipment to carry out detailed design, has taken a variety of measures designed to enhance the reliability of the whole dual redundancy system, design results can absorb three times the fault and some four degrees fault, through multiple assessment test, indicating that the system is designed with good reliability.