This paper counted and analysed the number of counties affected bydebris flows and the county times of occurence for destructive debrisflows. The results are as follows, 1. in 29 provincial (municipal) administrative divisions of China, 771counties (cities) the debris flows occured in, among them Sichuan Pro-vince is the most; 2. there are 92 cities or towns above couny-level suffered from debrisflow disasters, nevertheless, Sichuan makes up 40% of the total; 3. according to statistical data (1901-1985), the destructive debrisflow occured for 18 county-times annually in China, but during the pe-riod of 1901-1950 for 10 and of 1951-1985 for 29. Sichuan is over 50% ofthe average. 4. based on the partial statistical data, the death number in annualaverage caused by debris flow was 117 and 179 before and after liberationrespectively; annual average number of houses destroyed were 60 and 1590before and after liberation. This paper discussed the debris flow harmsto factory, mine, highway, railway, course, military, hydropower sta-tion, irrigation and water conservancy, as well as tourist trade, etc.