At the heavy and coarse sediment region in the middle reaches of the Yellow river basin

because of the high population density

insufficient cereals supplement

deficientfuel

fertilizer and forage resource

and serious soil erosion

the contradiction between population and environment becomes the principle factor which restricts the economic development of this region.The result obtained from management practices at 4 typical small watersheds show that

after comprehensive management for about 4～7 years

the population density could reach a appropriate degree

the contradiction between population and environment could be preliminarily resolved.meanwhile

the environmental population density of this region in the end of the century was predicted.