With the rapid development of network technology,Ethernet technology has become the most widely used local area network technology with its excellent features.The Ethernet standard consists of multiple protocols to form a complete system.The 10 Gbase-R protocol is one of the important basic protocol.This article is based on the PCS layer of the 10 Gbase-R protocol,and deeply explores the key modules within the PCS layer:elastic buffers,64 B/66 Bcodecs,scrambler/descrambler,bit-width converters,etc.It proposes a complete design architecture,and uses the verilog language to complete the RTL-level module design,then builds simulation verification platform and uses modelsim software to complete the functional verification,and completes related design.