Based on the mountain hazards events in the Tibetan Plateau during the period of 1930-2010, the impacts of global warming on mountain hazards in alpine area were analyzed. Under the circumstance of global warming, glacial lake outburst disaster and glacial debris tended to be more active. Disaster chain was apparent and showed a tendency of spatial and temporal extension, associated with the increasing occurrences of catastrophe. It showed a climatic characteristics of rain and heat occurring in the same period, which constituted a favorable combination for the formation of glacial debris in the southeast region of Tibet. Building distribution in debris-flow risky areas of Sangdeng Gully and Ganong Gully with an area of 0.014 km~2 in 1988 extended to 1.004 km~2 in 2012, economic activity overlapped with the high risk areas coupled with the increasing disaster risk due to climate change, and thus disaster risk in mountain regions significantly increased. The above results provide evidence about the impact of climate change on mountain hazards in Tibetan Plateau and preliminarily describe characteristics of the impact, which will help to reduce mountain hazards and further understand the corresponding impact mechanism.