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According to the actual requirements of remote distributed simulation and testing system, a design scheme of remote multi-function node is proposed, and a high-speed photoelectric conversion interface unit with high-speed SFP optical fiber communication and reflective memory network as the core technology is constructed; the interface unit consists of two parts: optical fiber converter and multi-functional interface module; the multi-function interface module takes FPGA as the control core, uses PMC and XMC structures for reference, adopts the hardware architecture form of the combination of universal motherboard and a variety of special sub boards, realizes a variety of universal interfaces such as digital IO, LVDS, RS422, ARINC429, analog quantity, and improves the reusability of hardware resources; GTX is selected as the physical layer for the communication between the motherboard and the sub boards, and a special communication protocol frame format is designed; the protocol analysis and communication control are realized through Verilog programming, which not only realizes the integration of multiple electrical signal interfaces, but also has the outstanding characteristics of low delay; the experimental results show that the data processing delay of the module can be stably controlled at 800ns-1000ns, which meets the requirements of transmission distance and real-time when data interaction between distributed simulation nodes.