The amounts of soil erosion and retention and their spatial distribution of the region were studied utilizing universal soil loss equation; and the techniques of market value, opportunity cost and shadow engineering were utilized to evaluate the value of soil retention function.

Soil loss was predicted and risk areas of soil erosion were identified in Dahongshan Iron Mine at Xinping of Yunnan province by means of combinin geographical information system(GIS) and universal soil loss equation(USLE).

Based on the multi-uncertainty characteristics of the information in soil, topography, raining, vegetation and management technology, the blind number method in unascertained mathematics is applied to describe and treat the characteristics of parameters in the Universal Soil Loss Equation (USLE).

Based on the RUSLE theoretically,with the ground investigation,we established soil erosion repository,construct the soil erosion monitoring method coupling the spatial information and repository,grading the intensity of soil erosion in Da Hingganling Mts.

Universal Soil Loss Equation (USLE) is an empirical model widely used in the domain of soil erosion by water.

It is estimated that the soil erosion amount before and after cutting in the eastern forest area of Daxinganling Mountains using GIS and USLE, the results showed that annual soil erosion amount before cutting was 4?858?658 55?t, and that after cutting was 141?099?989 4?t which was equal to 29 times of that before cutting.

Integrated with GIS,Universal Soil Loss Equation(USLE) was applied to predict the amount of.