Based on the field investigation on secondary geological hazards induced by 5.12 Wenchuan Earthquake

the types of geological disasters during or after earthquake are analyzed in the paper.The main secondary geological hazards are rock fall and collapse

landslide

debris flow

dammed lake

and so on.The development and distribution rules of secondary geo-hazards

with a long-term sustainability and a formation of hazard chains

are of relation with earthquake fault zone

and consistent with seismic intensity.It is necessary for the reconstruction to reveal distinctly the engineering geological condition of sites

and to eliminate or mitigate the geo-hazards by scientific planning.Certain geotechnical engineering measures should be taken so as to eliminate or mitigate landslides and collapses.The foundation design in mountainous areas should meet the requirements of related standards and codes strictly

and limit the disturbance of geotechnical engineering activities to geological environment.The results are useful in reconstruction of Wenchuan earthquake area.