Abstract: Geological hazard accidents often occur during the tunnel constructions especially in the condition of complex geology, such as the water and mud rush in karst region and the landslip of the faulted zone. The construction risk in tunnel is reduced effectively by the accurate advanced geological forecast, the construction security and the progress are guaranteed and the project accident's occurrence is reduced. According to Nada tunnel engineering of YunGui railway in Guangxi province, based on the correct geology forecast, the basic principle and method of TSP is introduced. And its application effect is discussed. Then by compared the forecast results with the actual engineering, the method of TSP in advance geology forecast is proved reliably.