Embedded computer modules feature a variety of interfaces and communication protocols,which increases the difficulty of debugging and maintaining equipment.To solve this problem,this paper propo-ses a maintenance interface unit design based on CPU +FPGA.This design accommodates various inter-face needs,facilitating debugging and maintenance across different modules,thereby enhancing test cover-age and convenience.The scheme maximizes the rich peripheral functionality and powerful data process-ing capabilities of the CPU,along with the flexibility and expandability of the FPGA.It integrates various interface modes onto the mainboard of the maintenance interface unit,with optimized performance and layout.Through debugging and testing,the scheme's feasibility and effectiveness are established,indica-ting significant application prospects and engineering value.