[Objective] The study aimed to find a new method calculating soil erosion modulus in order to provide basic data for planning of check dams and dam system, which could also provide important reference value to soil and water loss prevention.[Methods] Different levels of channel in loess hilly region has been chosen for research. Chose seventy-four different type of dam "check dam", which could also been seen as an aerated grit chamber. By the sediment information recorded of check dam, the amount of soil erosion of different levels of channel obtained. Meanwhile, combining field investigation and analysis calculation, try to explore a new method, which could get the accurate soil erosion modulus in loess region.[Results] (1) In complex terrain of loess hilly region, there is a negative correlation between soil erosion modulus and controlled area, which is corresponding to different channel silt dam;(2) Compared with the design value, the droop value of soil erosion modulus reduced significantly, which made silt dam can not be used, and makes silt dam holding negative effects in long-term.[Conclusion] Based on sedimentation volume of check dam, calculating the soil erosion modulus of controlled area is simple and reasonable. At the same time, a variety of methods could be used and comprehensive analysis, they confirm each other, so that we could calculate soil erosion modulus accurately.