As Trump’s domestic policies are facing difficulties, he has concentrated on foreign policies in order to obtain good results. Trump is executing East Asian policies by formulating U.S.-Japan, U.S.-China, U.S-Korea relations. Thus there is a need to research how two countries’ relations negotiation will get adjusted and improved with respect to trade-security aspects. This paper implements a theoretical analysis of foreign policy adjustment and negotiation made by external stimulations in trade-security aspects of the U.S. and Japan’s relations. As Trump agreed to maintain U.S.-Japan security system and construct new security system, he is strongly executing trade policies of bilateral U.S.-Japan FTA after withdrawing TPP. By putting in ‘odd man out theory’ method to understand 3 players’ negotiation and ‘prospect theory’ method for the analysis of defensive negotiation strategy to overcome rival relation, this paper explains foreign policy adjustment process between U.S. and Japan in the security-trade aspect.