Abstract: In order to solve the incompatibility of geo-location information in railway emergency management and implement the positioning and navigation of the accident site, this paper studied the conversion algorithm of onedimensional coordinate system to two-dimensional coordinate system, and expounded the calculation method of coordinate conversion point mileage and the implementation process. On the basis of this, the paper designed a set of positioning and navigation service system for emergency management of railway permanent way based on mobile terminal. With the help of Baidu map interface, the system took Java as an important development language, selected Android Studio as an integrated development environment, took some data of Beijing Shanghai Line as an example,developed by functional design, and implemented positioning and navigation. It is of great significance to rescue in emergency management.