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On the basis of analyzing the limitations of mobile IP protocol in pervasive computing environment and in combination with the technological advantages of mobile agent, this paper introduces a mobile-agent-based application model of pervasive mobile devices. With the introduction of mobile agent into the pervasive mobile devices, the application model enables all corresponding IP messages to go through the mobile agent, which can directly detect the status information of the IP messages, thus making it possible to switch the mobile devices smoothly. Through handoff delay analysis and simulation experiments, the paper also analyses and contrasts the performance of the pervasive mobile devices before and after the mobile agent is introduced. The results show that with the introduction of mobile agent, the pervasive mobile devices can switch smoothly and swiftly, decrease handoff delay and the status information in the process of the transmission and reduce the loss ratio of handoff of the mobile devices, thus effectively improving the performance of the mobile networks in the pervasive computing environment.