Fifty-two years ago today, on May 20th, 1973 (April 18th, 1973 in the lunar calendar), the Central Committee of the Communist Party of China held a meeting to discuss the issue of criticizing Lin for rectification. On May 20, 1973, the Central Committee of the Communist Party of China held a working conference in Beijing to discuss the issue of criticizing Lin for rectification. During the meeting, Zhou Enlai conveyed Mao Zedong's instructions on economic work: First, there are many projects, and the planned work has not been on track so far; Second, the planning depends on local governments, mainly provinces, municipalities and autonomous regions; Third, it is necessary to set up the cooperation area, once something is easy to handle; Fourth, it is wrong to only pay attention to production, not to superstructure and route.