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With the quick development of the Web service technologies, more opportunities and challenges are brought into the area of workflow. Service based workflow, which integrates and manages Web services distributed in the Internet, has grown to be one of the hottest topics in the workflow research areas. The high dynamic and heterogeneous nature of the Internet brings uncontrolled factors while integrating and invoking outside Web services in workflow. So the failed execution in service based workflow system occurs more often than that in the traditional workflow system. Thus transaction management is a key to ensure the successful execution of service based workflow. Based on a detailed analysis of the characteristics of service based workflow, it proposed a transaction management framework to maintain the integrity of workflow transactions. Using this framework, a workflow management system can improve its ability in processing transaction issues while managing service based workflow.