Serious secondary mountainous disasters，including collapses，rockfalls，landslides and debris flows，were induced by the earthquake stricken Yiliang County of Yunnan Province，China on September 7th，2012． Collapses and rockfalls，as major secondary mountainous disasters，led to not only sever casualties and building damage， but also delayed rescue actions due to consequential road blocking． Decreases in stabilities of most mountain bodies in seismic regions，caused by repeated influences of the earthquake and its aftershocks，may led to a period

of frequent secondary disasters in the future years or even decades，featured especially by the disaster chain ( rockfalls，collapses，landslides—debris flows—barrier lakes—dam brake ( flood，debris flows of even larger scale) ) ．In the present study，after a investigation along Yiliang county and Luozehe town，typical secondary mountainous

disasters which may be induced by this earthquake were analyzed and hazard mitigation suggestion were proposed aiming at these secondary disasters．