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As an important new paradigm for distributed computing, the mobile agent (MA) technology has a lot of potential applications in practical fields. However, the success of MA depends on its security. The common important problem of all existing security solutions in MA system is secure key management. This paper presented the key management tree architecture provided by core hardware module of trusted computing platform. So the keypsilas secure storage feature was discussed. Then generation and using of secure session key were proposed on the application to secure communication between host and agent.