Abstract: Under the circumstance of price competition,the reverse auction in electronic commerce can offer purchaser more products and services,therefore it will be more flexible.This paper presents the reverse combinatorial auction mechanism of procurement contracts,establishes the mathematical model of determination of multiple products optimal combinatorial supply patterns in reverse auction,and designs a bi-layer optimal algorithm to solve this model,finally,and demonstrates the applicability of the model and the validity of the algorithm by examples.

Key words: electronic commerce, reverse combinatorial auction, determination of multiple products optimal combinatorial supply patterns, bi-layer optimal algorithm