Abstract: This article made a research and exploration on Web Service technology to access railway Intranet through Internet, proposed a general method of crossing the railway safety platform through the analysis of the principle and structure of the railway safety platform, pointed out some shortcomings of the method. Based on the actual project of Harbin Railway Administration, an implementation method was given to access the internal resources agent program through Internet. The agent program achieved the configuration and zero programming to access resources of railway Intranet through Internet.