The ultimate bargain price is the result of unilateral competition among bargainers or purchasers in the traditional auction mechanism.The mechanism of fixing price hardly reflects the information of bundle or- ders and reveals the inherent value of the bundles.Based on a review of the current trading mechanism of prices on combinatorial double auction,this paper proposes a market cleaning algorithm to maximize per-bun- dle unit trade surplus by appling shadow prices.The trading mechanism of pri...