Does the arrival of the big data era represent the development of modular data centers? Obviously not. Big data is mainly at the application level of the data center, while the modular data center is mainly at the infrastructure level. Although the infrastructure is for the application, but there is no big data application, the data center has been to the modular direction, and never stopped the pace, the definition of modular has been moving forward. Modular data centers are dedicated to addressing the goals of data center infrastructure availability, maintainability, rapid deployment, on-demand growth, and more, and are now adding the requirement for energy efficiency as well.