The fully mechanized caving coal mining under the railway in mine area will result in difficult maintenance of railway because of great deformation and subsidence speed of terrene and railway. If the deformation forecasting of terrene and railwayis incorrect and maintenance measure is not suitable in the preceding and the process of mining, the normal operation of the railway in mine area will not be ensured and perhaps the safety accident will take place. Therefore, the railway subsidence forecasting and maintenance system for fully mechanized coal caving was studied and developed. Based on the accurate deformation and subsidence forecasting of the terrene and railway, the maintenance measure for track and switch turnout in railway is put forward in this system.