Recently the rapid development of information technologies has caused that computing resources including computational power, memory storage, network bandwidth, devices and instruments are commoditized and delivered in a manner similar to traditional utilities. Grid Market and Cloud Computing are focused on to approach this utility computing vision. A Market Oriented Grid Model (MOGM) based on contract management is further researched in this paper. Firstly, the differences between Cloud Computing and MOGM are discussed. Secondly, a new reputation evaluation model is proposed and applied into MOGM. Thirdly, a solution integrated with payment management and reputation management is discussed based on contract management mechanism. The simulation results reveal that the market can be kept in healthy operation.
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