Abstract: Changdu in Xizang and Sichuan(Chuan-Zang) power grid transmission project is One of the world's most challenging power grid transmission projects Construction so far, with extremely complex geological conditons, frequent and high risk geological hazards. In this paper, the geological hazards were investigated along the Chuan-Zang power grid transimission project line to analyze the regularity and characteristics of geologcial hazrad and evaluate the influent to the line project. The results from the study as follows: there are some typical geologcial hazards along the Chuan-Zang project line, such as collapse, slope, debris flow and unstable slope, which were concerned to the topography and lithology; the influent of geological hazards along the transimission project were reflected to the tower and construction camp, as the little risk geological hazards, the stride across and strengthen inspections could be used, as the high risk geological hazards, the tower and construction camp could be avoided or the stride across tower, otherwise appropriate support and strengthen inspections could be used. The scientific basis with important application value could be provided for the line selection and preventive meatures of transimission project base on the study of geologcial hazards along Chuan-Zang power grid project