Abstract:The devastating Wenchuan Earthquake occurred in Wengchuan,Sichuan Province,China,with a magnitude of 8.0 on May 12.The main earthquake zone was extended along the Longmenshan fault with 300 kilometers in length on the East edge of Tibet Plateau.Numerous geo-hazards broke out simultaneously and rock avalanches,rock flows,landslides,and debris flows responded the earthquake violently.Many roads were destroyed by rock avalanches,rock flows,landslides,which makes succor more difficulty.Debris was dashed into river channels at different sections,forming a couple of dozens of barrier lakes.These earthquake-lakes not only have flooded human habituations,roads and farmlands in the upstream but also would pose a great threat to the downstream cities once it were to break up.The geo-hazards in quake hitting area concentratively appear in the area very near faults.The post-earthquake geo-hazards will continue for years.At last,the countermeasures for disaster mitigation are suggested.