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In order to meet home users for interactive multimedia digital TV business requirements, design and realize the access of the digital television set-top boxes to the Ethernet functionality. Hardware design of embedded high-speed Ethernet interface chip DM9000A as the core, in the digital TV set-top box hardware platforms from a peripheral circuit connection, the address space and other aspects of design studies; software design, including software processes, DM9000A driver implementation, LwIP design, and application layer protocol interface software design. Proposed system testing program, through the entire digital TV STB Ethernet access system function test results show that UDP transmission speed can reach about 20 MBPS, the correctness of the interface timing of 90% or more, the performance of the system stability is strong, has reached the design requirements, the running effect of the whole system ideal, broad prospect of application.