Since mobile application technology is integrated into the smart grid，the information system and the network boundary of smart grid has been greatly enlarged. It will face a series of important challenges in the field of information security. This specific issue covers three areas: mobile terminal， mobile network and mobile application. From the perspective of mobile application scenarios of the smart grid， we analyze the requirements of mobile security applications， and then provide a trusted mobile security applications architecture which can systematically respond to security threats in the mobile application system of the smart grid.