Based　on　the　field　investigation　for　secondary　geological　hazards　induced　by　5.12　Wenchuan　Earthquake,　the　types　of　geological　disasters　during　or　after　earthquake　are　analyzed　in　this　paper.　The　main　secondary　geological　hazards　are　rock　fall　and　collapse,　landslide,　debris　flow,　dammed　lake,　sand　liquefaction　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.　The　buildings　located　in　secondary　geo-hazards　areas　with　a　high　risk　are　damaged　severely,　thus　the　site　selection　for　post-earthquake　reconstruction　and　related　geotechnical　engineering　issue　are　discussed,　which　are　useful　in　reconstruction　of　Wenchuan　earthquake　area.　©　(2011)　Trans　Tech　Publications,　Switzerland.