Abstract: The purpose of this paper is to increase the efficiency of Mountain Torrent Disaster,and to enrich the investigation results by oblique photogrammetry. The combined tilted-cameras which was developmented independently was used in this investigation to obtain images. Then, aerotriangulation and data were made by professional software automatically. Real 3-D mode,ture orthophoto and digital elevation model were generated in the meanwhile. The results shown that the efficiency of Mountain Torrent Disaster is increased and the investigation results are enriched Thus,the application of oblique photogrammetry in Mountain Torrent Disaster is reliable and effective.