In the paper,a domestic Ethernet switching system with a star topology is designed.The system adopts the startup configuration mode of EEPROM to realize startup and cascade connection of multi-chip switching chip SF2507.The system can support 16-channel adaptive Ethernet exchange and data communication.This system adopts the switch chip with built-in 5-port PHY transceiver,which has low development cost,simple design and convenient use.The design indexes and requirements provide a solution for the design and development of the domestic chip network switching system.