Abstract: In order to better protect the information security of railway mobile terminal and solve the security threats such as terminal out of control, unauthorized access, information leakage, etc., based on Virtual Security Area (VSA) technology, combined with Mobile Application Security Gateway (MAG) technology and Dynamic Encryption Channel (DEC) technology, this article researched and developed the railway mobile intelligent safety management platform (MISMP), designed the platform architecture, described the platform's business capabilities, control capabilities and security transmission capabilities. The platform provides a reference for the information security construction of railway mobile terminals.