Abstract: Application of Web service in distributing network manage system is introduced. WS-security（web service security），as a new criterion of Web service’s security it is introduced too. Involving communication layer and message layer, a security mechanism is designed. In this mechanism, HTTP basic authorization and SSL (secure socket layer) are used in communication layer to ensure security. XML encryption, XML signature and authorization technology are adopted to support the message layer. This security mechanism could satisfied all needs a network management system requests on security, such as authorization and verification, confidentiality, integrity and security log.

Key words: Web service, security mechanism, WS-security, network manangement