Abstract: The surplus profit from a mining right should be shared by the vendor and the vendee.In Guideline to Mining Right Valuation,the DCF method deducted social average pfofit from annual net cash flow,which was treated as the proportion the vendee should share in the surplus profit.There were two problems in such dealing way:(1)social average profit margin of selling and discount rate had repeated meaning theoretically,for they both reflected return rate of investment;(2)it would probably occurred that valuation resulted in negative value while in fact the mining right could bring surplus profit.By borrowing the notion of deduction percentage from common intangible assets assessment,the paper came up with a new method to partition surplus profit between the vendor and the vendee in mining right valuation.