Abstract: This paper examines advanced geological forecasting of landslide about one tunnel body during construction. It takes an expressway tunnel as an example for technology and evaluation. It introduces the general situation of the tunnel engineering and the basic engineering geological condition of the landslide. Several methods including trend extrapolation of geology, reflection wave of geological radar, and advanced borehole are adopted for analytical prediction about the features of landslide. These features include the extension, scale, material composition, engineering and physical and mechanical properties, and the spatial location-relation with the tunnel. A comprehensive conclusion is obtained about advanced geological forecasting. It can reduce and /or even avoid the defects of the single method, and put forward the corresponding construction treatment ideas.