COVID-19 and Sino US economic and trade frictions have caused a worldwide impact on the industrial chain, which is not to be eliminated in the short term. The general secretary delivered an important speech at the Symposium of experts in the economic and social fields. He pointed out that, "We should leverage the Chinese socialist system's advantage of concentrating resources to get things done,work hard on key and core technologies, create unique advantages conducive to the rapid and large-scale application and iterative upgrading of new technologies, redouble efforts to turn research outcomes into real productivity, and upgrade the industrial chains." Recently, the CPC Central Committee has repeatedly stressed to jointly maintain the stability of the industrial chain and supply chain, and proposed to "form a new development pattern in which domestic and foreign markets boost each other". In this regard, we should not only smooth the domestic industrial chain and strive to promote the upgrading of the industrial base and the modernization of the industrial chain, but also strengthen international coordination and cooperation, maintain the safety and stability of the international industrial chain and supply chain, and ensure the smooth flow of the domestic and international circulations, so as to realize the virtuous circulation of China's economy. This book compiles the recent research report of Yangtze IDEI into a volume, and makes an in-depth analysis of the environment and development direction faced by China's industrial chain in the post epidemic era.