East Asian countries, especially Northeast Asia, have been in a relatively loose state of economic organization and have not formed a unified regional trade cooperation organization for a long time. This departure from regional trade arrangements will undoubtedly have an adverse impact on the acceleration of economic globalization in Northeast Asian countries, leading to further strengthening of international competition. For their own survival and development, East Asian countries must work together to cope with the severe challenges brought about by economic globalization with collective strength. A concrete case of challenges brought by financial globalization. This lesson makes East Asian countries deeply realize that to resist and reduce the negative impact of economic globalization, we must strengthen regional cooperation, and the key to regional cooperation in East Asia is the cooperation among China, Japan and South Korea. Therefore, the economic integration of China, Japan and South Korea is the inevitable choice of China, Japan and South Korea under the background of economic globalization. Although Japan's early implementation of the "Greater East Asia Glory Circle" has caused the pain in the history of China and South Korea, unless this shadow goes far, any form of integration will not succeed. Too much emphasis on national interests and neglect of regional interests, only wanting to gain but not losing, this narrow "national interests supremacy" has also affected the development of economic integration among China, Japan and South Korea. Judging from the current progress of the dialogue on free trade agreements between Japan and South Korea, it is a very difficult process to conclude a free trade agreement between Japan and South Korea alone. If you add China, the difficulty can be imagined. In addition to historical issues, another important issue between China, Japan and South Korea is that the power structure is still unclear. In China, Japan and South Korea, there is obviously an imbalance of power. Japan is a member of the "Seven Western Countries" and an ally of the United States. China is on the rise, and its influence on the whole East Asia and even the whole world is increasing. No matter which country works hard in this process, it may be regarded as a struggle for leadership by the other side, and the degree of mutual distrust will increase. But in the long run, East Asian economies of China, Japan and South Korea need to deepen the mutual integration of trade and direct investment, which is an important foundation for peace and prosperity in East Asia. The integration of trade and investment is conducive to grasping the business opportunities created by traditional commodity production activities and realizing the value contained in the fields of finance, circulation and communication. In addition, the globalization of the world economy increasingly requires the close combination of trade liberalization and product standardization. The realistic connotation of product competitiveness not only refers to price, performance and quality, but also includes that products must meet various standards. Enterprises participating in global production chain cooperation must unify production standards and product standards; Standardization not only provides convenience for the management of the production process, but also saves transaction costs by reducing the supervision of the production process. Therefore, East Asian countries should cooperate to formulate and implement the standardization of related products, and the economic integration of China, Japan and South Korea is no exception. There are some problems in China, Japan and South Korea, such as product structure convergence, overcapacity and fierce competition in heavy chemical industry. In order to avoid excessive competition, large enterprises in China, Japan and South Korea need to establish strategic alliances, integrate the product structure in the region, and expand intra-industry trade based on comparative advantages or economies of scale. In this way, we can not only strengthen the cooperation of industrial sectors prone to trade frictions, but also promote technical cooperation and prevent trade frictions. To realize the economic integration of China, Japan and South Korea, the realistic choice should be to establish China-South Korea free trade area first, then consider Japan-South Korea free trade area, and finally form an institutionalized China-Japan-South Korea free trade area. The actual situation of intra-East Asian trade in world trade shows that through the regional agglomeration of direct investment, East Asian economy will gradually become the roof of the world economy equivalent to the EU single market and the North American Free Trade Area. In recent years, with cooperation mechanisms such as ASEAN meeting and APEC as the stage, exchanges and cooperation between East Asian countries and regions have become increasingly close, which is in line with the trend of world economic development and the interests of East Asian countries and regions. With the continuous improvement of the level of economic development, countries and regions in East Asia are increasingly showing a situation of mutual promotion and common prosperity. Experts and scholars agree that economic integration in East Asia is necessary and beneficial to China, Japan and South Korea. The coexistence of globalization and regional protection, the changes in the world economic system and the strengthening of East Asia's economic status all remind us that the inevitability of East Asia's economic cooperation is gradually increasing. Experts and scholars agree that economic integration in East Asia is necessary and beneficial to China, Japan and South Korea. Economic and trade cooperation between China, Japan and South Korea has begun. Therefore, the economic integration of China, Japan and South Korea is imperative.