Cloud Computing is a novel computing paradigm. It provides on-demand computing power in a simple way that users can access the resources via Internet with a friendly interface based on Web services. Grid Computing is another computing paradigm that has been established for more than a dozen of years. In contrast to Cloud Computing, Grid Computing adopts a rigid access interface that requires users' knowledge about the underlying Grid infrastructures. This work uses Grid resources for Cloud Computing. A Cloud service, called Software as a Service, was implemented on top of the Grid. Grid infrastructures are wrapped in a black box and users can access the Grid via Web services. The interaction to the Grid is automatically done by our system and the details of accessing the Grid are hidden from the users. Additionally, a graphical interface was developed to further simplify users' task in service request and data management.
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