Abstract:  In the field of space, the means of repairing spacecraft onboard are mainly about the onboard repair of software. The SPARC platform is the most widely used processor of aerospace industry in Chinese. Considering the spacecraft software onboard repair issues for SPARC platforms, a method of quadratic linking is proposed to generate onboard software repair inject code, which can solve the problem of onboard repair injection code relocation. After being injected through the ground remote control, using the hook function embedded in the spacecraft onboard software, the flexible implementation of the dynamic replacement and the recovery of the onboard function module can greatly improve the onboard software recovery capability of the SPARC platform. Through the practical engineering application of multiple onboard spacecraft, the feasibility and correctness of the method are proved, and it has a good engineering application value.