Debris flow is one of the most serious natural hazards in the Tianshan Mountains. According to trigger agent, the debris flow can be divided into storm type which is caused by flood, and glacial type which is caused by flood from melting of snow and glacier in hot weather. At present, debris flow causes damage mainly to transportation, sometimes to mining and residents in mountainous area. The catastrophic process and the forming condition of the debris flow show regional regularity, therefore, the research of its distribution, processes, and environmental condition is useful in mitigating the natural hazard.