The report of the 20th National Congress of the Communist Party of China proposed that "the next five years is the key period for the beginning of the comprehensive construction of a socialist modern country", and included "new steps in reform and opening up, the modernization of the national governance system and governance capacity is further advanced, the socialist market economic system is more perfect, and the new system of a higher-level open economy is basically formed" into the main objectives and tasks of the next period. The Central Economic Work Conference proposed that "we should adhere to the promotion of high-level opening up and steadily expand the institutional opening up of rules, regulations, management and standards". In this context, it is very important to further understand the significance of promoting high-level opening up to the outside world for economic work. In recent years, the world's unprecedented changes have accelerated their evolution, the epidemic situation in the century has a far-reaching impact, the trend of anti-globalization has risen, unilateralism and protectionism have risen significantly, the recovery of the world economy is weak, global problems have intensified, and the international economic, technological, cultural, security, political and other patterns are undergoing profound and complex changes. At present, the foundation of China's economic recovery is not solid, the triple pressures of demand contraction, supply shock and weakening expectations are still large, and the risks and impacts of external environment turbulence on China's economy are increasing. These challenges require us to better coordinate the domestic and international overall situation, build a new system of an open economy with a higher level, implement a wider range, wider areas and deeper level of opening-up, and promote the effective improvement of the quality and reasonable growth of the economy. This is not only the practical need to respond to the profound and complex changes in the international environment, but also the internal requirement to promote the high-quality development of China's economy. High-level opening-up provides institutional supply for the construction of a high-standard market system. Building a high standard market system is an important part of accelerating the improvement of the socialist market economic system, and is of great significance to accelerating the construction of a new development pattern with the domestic big cycle as the main body and the domestic and international double cycle promoting each other. Promoting high-level opening up to the outside world, standardizing international economic and trade rules, promoting in-depth reform, and steadily expanding the institutional opening of rules, regulations, management, standards and other institutions will help to build a more mature and stereotyped high-level socialist market economy system, and further stimulate the vitality of various market entities. High-level opening to the outside world provides assistance for the continuous optimization of the allocation of domestic and international resources. High-level opening to the outside world can effectively improve the quality and level of trade and investment cooperation, and make greater efforts to attract and utilize foreign capital. It is conducive to actively promote the accession to high-level economic and trade agreements such as the Comprehensive and Progressive Trans-Pacific Partnership Agreement and the Digital Economic Partnership Agreement, and take the initiative to deepen the reform of relevant domestic fields in accordance with relevant rules, regulations, management and standards. High-level opening-up provides stable and safe supply chain guarantee for building a new development pattern. China's economy has been deeply integrated into the global industrial chain, supply chain and innovation chain, building a new development pattern, and focusing on improving the toughness and security level of the industrial chain supply chain need to be promoted under open conditions. On the one hand, it is necessary to fully rely on the advantages of domestic large market and industrial chain to form a large country economic development model dominated by internal circulation, and enhance the endogenous power and reliability of domestic large circulation; On the other hand, we should form a smooth external circulation system through high-level opening to the outside world and improve the quality and level of international circulation. Only through the inside and outside