金融危機後，東協尋求進一步區域經濟合作，中國大陸有爭逐區域霸權的思維，提供市場及其他公共財予東協，兩者開展合作；而日本憂慮中國大陸崛起，也積極與東協合作，但是多邊制度甚至一開放的東亞區域經濟建制對日本有利，不過欲保持自身自主性的東協及欲排除其美國於東亞勢力的中國大陸並不贊成。中國大陸也認知到區域內需中日共存與合作；日本雖欲建立制度領導，但仍遭遇東協與中國大陸之疑慮，況又有來自國內保守壓力；但是東協透過集體與中國大陸簽訂「自由貿易協定」，再由東協成員國個別與日本簽訂自由貿易協定的方式，尋求東亞經濟合作，使得東亞區域雖無一正式化經濟合作制度，但彼此卻已展開實質經濟合作，本論文將要探討在這過程中，東協國家如何彈性地避開爭議又獲得東亞地區實質合作的進展。 / After the financial crisis, ASEAN sought for further regional economic cooperation. China bearing the thought to pursue becoming the regional hegemony provides ASEAN with public goods and ASEAN started to cooperate with China. And Japan who was worried about the rise of China began to cooperate with ASEAN actively. But the multilateral regime, or a open-end East Asia regional economic regime is more beneficial to Japan. ASEAN who wants to keep their self-autonomy and China who has a strong wish to exclude the U.S. influence form East Asia do not approve to build the multilateral economic system in East Asia. China recognizes that China and Japan must work economically together and co-exist in East Asia. Although Japan who needs to handle the doubts of ASEAN and China hopes to build a system and to lead the economic cooperation within the region, Japan encounters the conservative power domestically. ASEAN who looks for the economic cooperation in East Asia by concluding the Free Trade Agreement with China collectively and Japan individually to make real economical cooperation in East Asia. This paper is going to discuss how does ASEAN flexibly avoid the disputes and achieve real economic cooperation progress during the economic cooperation process.