Abstract: Wenchuan Earthquake happened in weak geological environment of the mountainous area. Both internal and external earthquake vulnerable geologic forces can accelerate the geological environment change in the disaster area. Changes in the process can appear different geological effects and geohazards. People have paid full attentions to the earthquake secondary geological hazards. In the disaster reconstruction process, they notice the geological hazard survey and evaluation, and site selection from fault zone. They can avoid major geological disaster and bad geological, major geological disasters to the management. However, after the earthquake, disaster geological hazards on the lag of the damage still beyond the people's imagination. The Zhouqu debris flow, Qingpping debris flow, the 213 national highway destroyed by the earthquake are warned us that geological disaster prevention and control of the situation are still severe. The need is increased for attention to disaster geological environment, the present situation and the prevention of geological disasters science and technology research. Early effective means of disaster are also needed. This paper studies the disaster area landscape change, the surface damage, mountain earthquake cracked, hydrogeology conditions change, geological disasters such as development features of geological environment situation. It analyzes the evolution process of the earthquake, the surface slope geological environment change process, the influence of the external factors, collapse, landslide and debris flow relationship geological disasters. It summarizes the geological environment changing process of the development of the geological disaster distribution characteristics. It proposes the rebuilding after the geological disaster prevention and control measures to stage. Conclusions are as follows.(1)After the changes of the geological environment speeding up, all kinds of surface slope destruction of geological environment evolution of external factors in a highly sensitive period.(2)the earthquake and its aftershocks of repeated impact damage, outside the moment of load overlay, decades, geological disaster on high frequency, multiple, an unexpected period.(3)After the reconstruction phase should strengthen the investigation of geological hazard assessment, and to pay attention to the special period and the important section of disaster prevention and control, to take the investigation and assessment of predicting+the crowd monitoring to prevent+monitoring and warning+move geological hazards+engineering management and so on.the many kinds of combination prevention and control measures have to be adopted after geological disasters.