Abstract:The basic principles of tunnel seismic prospecting TSP-202(tunnel lead geological forecast system),the technical conditions,the technical problems which can be resolved in tunnel lead forecast,the application effects,and the attainable technical indices are presented. The development of TSP interpretation technique in the Bridge and Tunnel Construction Geotechnic Institute of Shijiazhuang Railway College is also introduced through practical examples. The economic effects of TSP are analyzed,and the existing problems and the solution approaches are discussed,too.