This paper analyzes the general strategic pattern under the struggle of the Sea Power and Land Power inside the Asia-Pacific geopolitics. For its special geographic structure and historical experiences, the Asia-Pacific security situation is extremely influenced by the struggle of the Sea Power and Land Power. This study focuses the strategic interaction between the Sea Power and Land Power, the change of power structure in Asia-Pacific region after the II world war. From the triangular relation of USA, USSR, and PRC to bilateral relation of USA and PRC, this research especially wants to examine how this relation shift influences Asia-Pacific geopolitics. On one hand, the USA's fan-spread strategy is to frame the ocean countries alliance in the rim of Asia Continent to become her deployed base. On the other hand, the USA global strategy attempts to divide the relation between the former USSR and PRC. Although these two countries had been opposed for their own strategic concern during cold war era, PRC has replaced Russia to be the main power in Asia Continent by its economic achievement and national strength building in post-cold war. Besides, PRC and Russia are likely to form the united frontline to match USA security strategy. The Asia-Pacific security setting after cold war has been shaped within the strategy arrangement of the USA and PRC. Compressed by the struggle of USA and PRC, other Asia-Pacific countries either pick one side for individual national interest or turn between two sides to maximize profits. Certainly, the solutions of security problems in the controversial areas of Korea Peninsula, Taiwan Strait, and South China Sea are constrained by the two main powers. However, under the struggle of the Sea Power and Land Power in Asia-Pacific, Taiwan has to take the advantage of the position of middle-way in order to maximize interests.