Shenfu-Dongsheng mine site is located in the passage of arid and semiarid zone. Based on the fragile eco-environment

coalmining and construction have brought out some new environment problems.Man-made debris flow problem is the most serious of them which caused by coalmining

construction of railway and highway as well as exploi ting stone. Because of the particularity of forming process of man-made debris flow

the watershed geomo rphy is very distortion. Throug hevery landform factors of watershed systema tically analyzed

the results show as follows. (1) The gully bed gradient takes conv exshape as the dominant

that is a unique form of man-made debris flow gully. (2) Regional area ratio is the largest in converge water region

and the watershed formation of fan-shaped make up 80 percent of the total sample gul lies

it is favorable to water concentration and a particular demand of motive power of debris flow in semiarid area. (3) The landform rugged coefficient of watershed is not suitable to olarge and the area of providing water for gully formation is larger in semia ridregigon than in moist region.