Northeast China, accounting for about one eighth of the total national area with an area of over 1.23?10⁶ km² is one of the important bases of agriculture, forestry, animal husbandry, energy and heavy industry, with vast territory and rich resources. Affected by natural and artificial factors, the regional environment is becoming more and more serious and debris flow occurs almost every year. The above-mentioned causes great damage to the life and property of the people and hinders the development of regional economy, thus, it is a crucial task to make research on the disaster of debris flow. According to the one-year study and practice of debris flow in northeast, this paper describes the comprehensively environmental setting in which debris flow is formed, state of debris flow activity, basic features, main types and laws of distribution, then, makes the first discussion about the trend of development and countermeasure of prevention and control of debris flow.