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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. In all security problems of MA system, the malicious host issue is always a difficult problem. If the computing environment could report its integrity attestation, MA could validate the trustworthiness of computing platform. Then it could execute itself function on the trusted platform. This paper discusses the secure framework on trusted computing platform accord with trusted computing group (TCG) specification and trusted loading of mobile agent environment program on trusted computing platform. The integrity challenge protocol between mobile agent and computing platform was designed and proved to enhance security of MA.