Abstract: The Wenchuan earthquake on May 12, 2008 is the most destructive large magnitude earthquake inducing the worst geohazards after the founding of new China. The main research achievements and results of the project entitled "Investigation and Evaluation of the Wenchuan Earthquake-induced Geohazards" are presented in this paper. By using technologies such as whole space-aerial-ground investigation, geophysical detection, GPS displacement monitoring, slope ground motion testing, and large physical simulation, the development features of the Wenchuan earthquake-induced geohazards were investigated, and the forming mechanisms of the geohazards caused by coupling endogenic and exogenic geological processes were preliminarily revealed. In order to meet the needs of reconstruction of the earthquake region, a series of key technologies for high-position debris flow prevention and monitoring and early warning were used to provide technical support for major geohazard monitoring and warning, as well as post-disaster reconstruction, in susceptive strong earthquake mountainous regions.