Debris flow is a kind of geological action between streamflow and landslide. Under appropriate terrain conditions, a large amount of water permeates the solid accumulated materials on the hillside, reducing their stability. The moisture-saturated solid accumulated materials move under the force of gravity, forming debris flows. Debris flow is a disastrous geological phenomenon. Debris flows often burst suddenly, coming with great momentum. It can carry huge boulders, advance at high speed with strong energy, and be highly destructive. There are more than 10,000 debris flow gullies in our country, most of which are distributed in Tibet, Sichuan, Yunnan, and Gansu. Debris flows burst suddenly and powerfully and do not last long, usually ending in just a few minutes, or at most one or two hours. Because debris flows are difficult to forecast accurately, they tend to cause significant casualties. Therefore, it is important to predict debris flows before they occur.