This paper is attempted to analyze negotiation behavior under asymmetrical power structures. Topic discussed in the paper including factors that made negotiators decide to enter negotiations, tactics that parties with different power structures employed during the negotiation, as well as outcomes of negotiations under asymmetrical power structures. After a comprehensive study, we were led to the following conclusions: First, both the stronger parties and weaker parties had their own considerations about if go to the negotiating table. There was no pre-set rules of thumb for stronger or weaker parties to follow. Second, as far as tactics were concerned, there was also no rules to predict whether a stronger party or a weaker party would attack the other side, or which party would have a stronger tendency to cooperate. Factors such as negotiators’ perceptions about “power”’ the strategies, such as “increasing alternatives” or “strengthening commitment”, that weaker party used to boost its power position; and the absolute power difference between two negotiators, i.e., how “asymmetrical” were their power structures, were all determinants that influenced negotiators’ attitudes. Third, as to tactical suggestions for the weakers party, “using binding commitments” and “finding leverages in international situation or international organization”, would be two useful ones that deserve our further attention.