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Cloud computing allows to access large amounts of scientific data and scientific computational resources efficiently through a variety of service interfaces. This paper presents a data cloud model called MatDC, which is designed for material scientists to conveniently integrate and analyze material science data. MatDC is a domain scientific data platform with the cloud computing. It not only provides an easy interface for user to access large amounts distributed resources through web browser, but also creates a flexible mechanism for cloud provider to deploy and replace the data-intensive application. In addition, highly modularity is the characteristic of MatDC, well-defined service API with module improves reusing and sharing service components. We describe the architecture of MatDC and illustrate the core data cloud services in detail. Finally, an experiment is prepared to show how MatDC is used to support material scientific activity.