Xiaojia Gully is a typical debris flow gully in the earthquake zone near Yingxiu town which located in the left of Yuzi River, and has a drainage area of 7.19 km² and an average longitudinal slope of 485‰. Many debris flows occurred in this gully after Wenchuan earthquake. In August 14, 2010, a large scale debris flow(the volume is about 6.50×10⁵ m³) was triggered by heavy rainstorm, blocked the Yuzi River and caused dam-breaking disaster. Xiaojia Gully was risky because of its large amount of loose materials and abundant rainfall. The Yingxiu part of S₃₀₃ highway would be interrupted if the debris flow occurs. The Yuzi River would be blocked in the condition of large scale debris flow, and the dam-breaking flood could potentially cause damage to the newly constructed Yingxiu Town. At present, the gully still had 5.22×10⁶ m³ of solid materials, of which about 2.02×10⁶ m³ was prone to debris flow in the future when it encounters great rainstorms. Analyzing the activity characteristics of Xiaojia Gully debris flow after the earthquake based on formation conditions, the brief ideas for Xiaojia Gully debris flow control were discussed.