Abstract: Web service has been greatly developed as a distributed, lousccoupled networked system technology. But the problems of service invahdation,UDDI not supporting service selection and optimization,and services found cannot efficiently satisfying the demand of user rectuirement still haven't been solved. the paper brings forward Web service discovering algorithm based on information description framework. hhrough the research of Web service formalized description, service selection algorithm and service optimization sort algorithm, and with the experiment and analysis, the research validates optimized algorithm efficiently improves recall and precision rate of service discovering, and strikes a stable base for the improvement of Web service discovering efficiency.

Key words: Information description framework,Web service,Discovering algorithm,AHP