Abstract：In view of the actual situation that there is still not any systematic theory of geological prediction for the tunnel construction，the concept of geological prediction ahead of construction for the tunnel and technical scheme of geological prediction have been constructed on the basis of the previous research results；and a complete set of geological forecasting techniques including the macro forecast，the long-term prediction，the short-term prediction and the alarm of the disaster approach，have been proposed based on the theory of geomechanics. According to the practical test of the prediction in Xiamen subsea tunnel，the accuracy of the prediction can meet the requirements of the construction standards. It shows the rationality and feasibility of the related theory and the technical method；and the proposed technical method can provide some references to the tunnel constructions.
