Abstract: As the number of Web services increases quickly,how to compose Web services into loosely-coupled system to fulfill flexible business requirements becomes a popular research topic．Traditional process-driven based service composition methods and frameworks predefine the composite process．When the local business-process changes,the whole composite process must be redefined again which lacks of flexibility．This paper introduced a semi-automatic semantic service composition method．The abstract service is used to describe the local dynamic process and will be automated replaced by composite service at execution phase when there is no candidate concrete service suitable for the abstract ser-vice．A backward-tree based service composition method was proposed for the replacement of the abstract service and semantic information was applied to improve the recall rate of Web service．Considering the selection of composite processes,the QoS evaluation method was introduced．Based on business process method,this paper proposed a semi-automatic semantic service composition framework.OWL-S technology is used for the description of the dynamic process．Finally,an application of credit evaluation case is shown which presents the availability and flexibility of the framework.

Key words: Process-driven,Semantic Web service,Semi-automatic service composition,QoS