The soil erosion environment in the agriculture and animal husbandry interlock zone of the middle and upper Yellow River formed in the geological period and develops in the mankind historical period. There is obvious difference in space for the modern erosion environment. Characteristics of factors in the erosion environment are as follows:① For precipitation, there are inter annual fluctuation and inner annual concentration in time and non even distribution in space; ② Loose composition materials of the earth surface are characterized by a sort of sandy materials; ③ Simple vegetation type with low coverage is dominated by herb. Sediment yield caused by interaction among the factors in the erosion environment has the following characteristics:① Complex erosion types; ② Multiplex sediment sources; ③ Non even distribution in space and inter annual fluctuation and concentration in time. At last, it is pointed out in this paper that it is difficult to change eco environmental properties of the agriculture and animal husbandry interlock zone, but it is possible to restrain erosion and restore the environment by adjusting relationship between man and the earth through returning crop plots to forestry and grassland, adjusting land use structure and industry structure.