In the paper,a Gigabit self-adaptaion Ethernet system based on FPGA configuration is designed.In the main structure of Virtex-5 FPGA with the Embedded Tri-Mode Ethernet MAC IP core embedded plus the PHY chip of 88E1111,through the function configuration of the PHY chip,the purpose of realizing 10/100/1000M bandwidth self-adaptation and Ethernet protocol by means of hardware based on FPGA software is achieved.The experiment results show that the design realizes efficient transmission of Ethernet data which has a great improvement over traditional software implementation,and has high application and promotion value.