Abstract
In order to improve independence and autonomy capability in Web services deployment and publishment, and enhance understanding or updating capability of service knowledge between service agents in service discovery and composition. Following a conjunctive study of agent and Semantics Web services technology, service knowledge model and extended service description layers are proposed to accommodate agent negotiation, and design methods for revising and updating service agent’s belief knowledge. It finally overcomes those defects that Semantics Web service can only comprise straightforward computational procedures with passive and predictable behaviors.