With the demand of data center traffic soaring, many service providers are already working on 400 Gbit/s Ethernet communication systems. Compared with the 100 Gbit/s optical module, the 400 Gbit/s optical module can provide higher transmission bandwidth with lower power consumption and cost. Aiming at the above requirements, this paper proposes a design scheme of 400 Gbit/s optical transceiver module for data center optical communication network system. We first introduce the 400 Gbit/s optical module related protocols and standards. Then we present the general design of the module framework, mainly from the rate of conversion, launch, receive and monitoring 4 parts. Finally, we conduct a performance test and the test results show that the module in accordance with the agreement and the provisions of the standard, which is a good solution to realize data center 400 Gbit/s Ethernet transmission.