The Wenchuan earthquake of China has produced strong disturbance to ground surface, which made secondary mountain disasters to be extremely developed. As is well known, in the Wenchuan earthquake area, there are 3~4 × 10⁴ landslides or collapses which provide abundant loose material for debris flow. With effect of heavy rainfall, it is common to see large-scale and simultaneously occurring debris flows. Due to the active occurrence of landslide and debris flow, disaster chain behaves strongly and its hazard to human environment is obviously represented. In this article, characteristics of some typical earthquake-induced disaster chains have been analyzed. And their relation rules are summarized. In an unbroken disaster chain, there are four key links: disaster formation phase, disaster triggered phase, disaster damaging phase, and chain-cutting phase. Moreover, the controlling factors in the process of disaster evolution have been analyzed. The induced factors mainly focus on complex geological and geomorphological conditions, rich loose earthquake-induced deposits, local special triggered conditions, post-earthquake hydrological conditions, and human factors. Also the analyzed result illustrates that, geological factors play a primary role in disaster formation and evolution, and other factors can induce or trigger disasters.