The solution of Mobile Agent system's security problem has
been studied very deep. In this paper, on the basis of these studies, combing with the latest Internet security research, on the basis of Mobile Agent's effective authentication, CA mechanism, via Mobile Agent's hierarchical management and authentication, a regional breakdown of the network hosts and security level classification of its resources, We built an effective security scheme of the network host control mechanisms, the better solution to the security issues of network host supporting Mobile Agent. Due to the limited space, this paper do not discuss the details of some issues such as the Mobile Agent's local security mechanism, the regional division of the network host, the host resources security level problems, etc. Mobile Agent system security is a system engineering issues, including the host security, and the safety of the Mobile Agent its own, it needs to be more careful detail secure protection mechanisms. With the Agent's application in the future, the wide research work needs to be further indepth.