Research methods ：Through review of the geological problems in tunnel construction and investigation of the present situation of geology forecast, the summary is made for means and their characteristics of geology forecast in advance for tunnel construction arid the analyses are made for the problems from the areas of means and ways.
Research results：As a result , the key point of geology forecast in advance for tunnel construction is to forecast disaster geology which should be made after making an evaluation of construction safety and stability with geological theory and should cover a wide range，except survey of unfavourable geology. The suggested values of the vertical and lateral survey ranges are put forward for geology forecast in advance.
Research conclusions： The following views should be had; the work of geology forecast is an extension of informationalized construction, the geologic process should be taken into account in the forecast and the prospecting technology should be tried to monitor and control the characteristics of geology in front of excavation face. The following coordinated forecast thoughts should be encouraged: the geology forecast rule should be worked out, the operation standard should be uniformed, the evaluation system for geology forecast should be established and many means and ways should adopted together.
2007, Vol. 24 
