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With the electric power enterprise business scope expands, the demand for mobile office is becoming more and more urgent. In this situation, how to realize security communication and data exchange between mobile terminal and enterprise internal network depend on public network has become a key problem to be solved for various enterprises, especially electric power enterprises. In this paper, after analyzing the present situation of electric power mobile terminal secure access, we design the electric power mobile terminal secure access system, aiming at meeting the special requirements of the electric power enterprise information protection. The system consists of three key aspects: access terminals, transmission channel and the application system, with which a stereo protection for the mobile terminals is realized.