Abstract: With respect to the seller's quantity discount for multiple units of commodity,the purpose of this paper is to study the multi-attribute trade matching problem with buyers and sellers in electronic brokerage environment.Firstly,based on the curve of quantity discount of commodities from sellers,the new definitions and calculational methods of trade matching degree from both buyers' and sellers' points of view are given Secondly,a mathematic model is built to maximize matching degree with its weight.Then,according to the non-continual and nonlinear characteristics of the model,a predatory search algo rithm with chaos is proposed to solve it.Finally,computation on simulation examples and comparison with genetic algorithm shows the model and algorithm are feasible and effective.

Key words: electronic brokerage, quantity discount, multi-attribute exchange, trade matching, predatory search algorithm, chaos