Great changes have taken place in Japanese foreign and maritime policies since PM Abe took office at the end of the year 2012. The expansionism and realism in Japanese maritime security policy gradually strengthen，playing an unpredictable role in peace and stability in the East Asia and regional maritime environment. The strategic concept of Japanese shift from “an island country” to “a maritime power”，as an integral part of Japanese national strategy，has close connection with its goal of “national normalization” and becoming political and military great power. Through maritime strategy，Japan attempts to guarantee its “territorial safety”，the security of sea lanes and economic safety，sharing the control of the maritime interest in West Pacific region with U.S. In order，Japan deliberately intensifies the maritime tension and escalates the crisis relating in Diaoyu Islands，the East China Sea and the South China Sea，exaggerating “the China threat”，assuming an aggressive stance in implementing maritime strategy and putting pressure on China. The action that Japan takes has worsened the Sino-Japanese relations，complicated the issues concerning disputes over territory and maritime interest and brought up the uncertainty of peace and stability of regional and international community.