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The soft error represented by single event flipping is one of the main factors restricting the spatial application of COTS devices; In order to meet the requirements of radiation protection for highly integrated satellite electronic systems in space applications, a single event flip reinforcement method for general multi-core processors is proposed. Through software level dual core mutual inspection, the reliability of COTS devices is fully improved without additional hardware overhead, with good portability and strong engineering practical value; Conduct software fault injection experiments, inject error information at key nodes of program execution, and verify the practicality of the dual core mutual inspection method; The experimental results show that the dual core interlocking method can 100% detect single event flipping generated in the system, and its ability to resist soft errors meets the application needs.