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The Mobile Agent (MA) has been seen as a promising distributed computing technology. According to the analysis of security problems of current mobile agents that are exposed in opening environment, a model system for mobile agent is proposed in this paper. In this system, the mobile agent security is enhanced by the Trusted Computing Technology. The mobile agent security supporting environment (MASSE) is designed by using trusted software stack (TSS) and trusted computing platform (TCP). To improve the security of MA system, some MA security services, such as authentication, role based access control and MA negotiation, are discussed in this paper. The working process of MASSE is also described.