The Wenchuan Earthquake on May 12th, 2008, triggered a large number of debris - flow disasters, resulting in a significant number of casualties and huge economic losses. In the years following the earthquake, debris - flow disasters in the disaster - stricken areas continued to occur frequently after several rainy seasons. This paper takes the debris - flow in Yuchi Gully, Xingguang Village, Huangyang Town, Pingwu County as an example to study the formation conditions, basic characteristics, and control measures of mountain torrential gully - type debris - flows.The debris - flow in Yuchi Gully is a diluent debris - flow with a bulk density of 1.62 t/m3. Using the rainfall - flood method, the peak flow rate at the gully mouth of the debris - flow with a recurrence interval of 20 years is calculated to be 19.32 m3/s. The total volume of a single debris - flow passing through is 25,400 m3, and the solid material discharge of a single debris - flow is 10,500 m3. These data provide design parameters for the debris - flow control project.Based on these findings, a comprehensive control measure of "submerged sill group + slit dam + drainage channel + covered culvert + road surface restoration" is proposed, and it has achieved good control results. This measure has certain reference value for the design of control projects for similar torrential gully - type debris - flows, especially those with large longitudinal gradients, narrow channels, and no reservoir storage space.