Rational use of land resources and sustainable development of environment are the two hotspots for the integrated control of soil and water loss.Based on the monitoring data

the structure and functions of the integrated control measures of soil and water conservation and its benefits in Huairou district of Beijing City are analyzed.It is shown that rainfall is the main exogenic force for erosion processes.In Huairou district

rainfall

rainfall intensity

and rainfall erosivity are very different in spatial and temporal variability.Rainfall erosivity is higher in the middle-south part of the district and descends to the north and south.This is consistent with the observation that the Huairou district is in the rainstorm center of Beijing City.The monitoring data from 2005 to 2006 indicate that soil erosion intensity and contaminant loss rate are low in the key protected area and key supervised area.They decrease year by year but the decreasing trend is gentle.The decreasing trend of soil erosion intensity and contamination loss rate is much more evident in the key controlled area than other areas.At the same time

rainfall amount in 2006 is less than that in 2005

and however

runoff volume is higher than that in 2005.All of these show that the three line defense measure for soil and water loss control is effective to control soil erosion and improve environment in the district.