According to the basic principles and methods of environmental economics

the value losses of soil erosion in Beijing is analysed and estimated. The valuation methods also were summarized. The results indicated that the total loss value of soil erosion is 221 603 700 yuan in 2001. It is 10.35% of agricultural GDP of the year. The losses of nutrient

mainly including N

P

K and OM is 143 685 700 yuan and it is 64.84% of total losses of soil erosion. It's loss proportion is the greatest one in these valuated factors

the economic value losses of soil erosion in Miyun and Mentougou districts is the most serious in Beijing. Meanwhile

the paper concluded that the economic loss of soil erosion in Beijing is 13 500 yuan/km~2 in 2001. By valuation

the economic loss of 42 yuan would be avoided at least if we invested one yuan in soil erosion. At last

a new assume of optimization treatment level of soil erosion is made up with for the researchers to study it deeply.