On the basis of analysis and evaluation for the structure, function and principle of the current negotiation support systems (NSS), this article advances that the NSS is a convincingly tool for solving the non structured negotiation problems. As negotiations are considered as a key component of electronic commerce, the technologies that can improve the effectiveness and efficiency of the web based negotiation are becoming necessary. Now, much of the NSS research literature has been concerned with describing paticular systems devised to support one or another aspect of negotiation．And the developed NSS are usually used for negotiation teaching and training．Aiming at the current problems，this article discuses the model principle and system structure for this new kind NSS called electronic commerce—oriented negotiation support system．It will support remote negotiations over simple or complex problems in EC situations．Furthermore， rhe article advances a model called multi objects bargaining．which eo3fl keep away from the dependency of the utility function for the traditional multi—object decision model and bargaining theory mode1．On the basis of the model analysis，this article discusses the system construction and the key technologies for the new NSS．In the end，the article points Out that the EC—oriented NSS is the tendency for NSS development