Abstract: The Sichuan-Tibet Interconnection Project is the first power network engineering entering into Tibet, which stretches more than 3700 kilometers from Xiangcheng County through Batang County to Changdu City. This project, passing through the Jinsha River, Bachu River, Dingqu River and Mekong River, locates in the transition zone between the Qianghai-Tibet Plateau and the Yunnan-Guizhou plateau and the collision zone between the Indian plate and the Euro-Asian plate. There is no doubt that the project with low-lying in West and South and highland in East and North is the highest Interconnection Project in the world for the elevation changing from 2400m to 5000m, the average elevation of 3850m and the highest elevation of 4918m. In addition, the poorest geological condition and the largest number of geological disasters in the world endanger the constructions and operations of the Interconnection Project. According to the geological information, which includes geological disaster investigation and classification information and prospective design information along the power network area, and the remote sensing images, the geological environment information is summed. Apart from the geological environment information, more details about topography, lithology and the distribution of faults and geological disasters are used to divide the project into 5 regions, which are the poorest, poor, little poor, good and best regions, and the engineering geological condition in each region is analyzed in detail to assure the safety in constructionin this paper.