Hundreds of Quake lakes were formed by the great Wenchuan Earthquake of May 12, 2008. Taking risk mitigation of Quake lakes on Mianyuan River for example, this paper qualitatively analyzes factors influencing breach risk of Quake lake group. These factors include river channel distance from landslide dam upstream to the upstream face of dam downstream, river channel characteristics, composition of landslide dam, breach water volume of upstream landslide dam, height and width of breach, and geometry of downstream landslide dams. Risk mitigation and retrofit measures are suggested for Quake lake group on Mianyuan River.
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