Abstract: With the rapid development of mobile Internet and the popularity of intelligent devices, more and more traditional services are run in mobile devices. Due to the openness of mobile networks and intelligent devices, the threats faced in identity authentication and data transmission are more severe, therefore, how to ensure the secure access of mobile terminals become ciritical in mobile App. Based on the SM2 algorithm, threshold signature theory and previous studies, a lightweight collaborative signature scheme suitable for mobile device is proposed, and applied to the identity authentication and data security transmission of power grid mobile GIS. The scheme requires No additional security media, and are more practical in the security and user experience.