In response to the problem of existing traditional wave division multiplex（WDM） cannot simultaneously meet the needs of operators for large-scale deployment and cost reduction and efficiency improvement. This paper analyzes the advantages of metro box WDM devices over traditional WDM devices in terms of open decoupling, low energy consumption, and low cost. Combining demand scenarios such as internet data center（IDC） and metropolitan area cloud networks, the paper proposes the network deployment and application suggestion of metro box WDM devices, which has strong feasibility.