A new classification framework for the models of the medical data center was proposed in this paper.In the framework,the models of the medical data center were divided into some categories which are the Decentralization,the Centralization,the Distribution based on B/S or C/S and the Centralizing on cloud particularly by the trends and the truth.As the development of cloud computing,the public data center based on the cloud may be construct rather than private data center.The cloud computer in essence is the implementation of the abstract and the encapsulation for a higher level.For the cloud computing,everything is services and services is everything.