Because of the growth of the Internet commerce, the individual online transactions will grow up rapidly. So in this paper we proposed an interactive negotiation agent system on the Internet to help buyers to make decision. We use multi-attribute utility theory as the basic decision making strategy and the theorem is useful for the decision of multi criteria. We stated the user?s goal that can be divided into several independent goals and the sub goals can be negotiated with sellers in parallel. On the other hand the user cannot handle the complex process individually, we take advantage of the agent technology as the major system developed approach.