Abstract: With the large usage of Web service technology, how to find the more suitable services fmom Web services with similar functions is a urgent problem. This article extended the concept of Web service ontology OWI- S and some service quality indicators were added into the research such as cost, time, reliability and so on. The research quired standard measure indexes from many aspects. According to these measure indexes was used to deduce the ranking of Web integrated service with similar function. The，evaluation results will model was huilt supply the help for the service choices.

Key words: Web service, QoS, Service evaluation, QoS feedback