On this day 124 years ago, on March 5, 1901 (January 15, 1901 lunar calendar), Chinese sociologist Wu Jingchao was born. Chinese sociologist. Anhui Huizhou (now Shexian County) native. Born on March 5, 1901. Died in Beijing on May 7, 1968. He was admitted to Tsinghua School in 1915, and went to the United States to study at the University of Minnesota in 1923, where he received a bachelor's degree. From 1925 to 1928, he entered the University of Chicago and received a master's degree and a doctorate. In 1928, he returned to China and served as a professor and head of the Department of Sociology of Jinling University. In 1931, he served as a professor of the Department of Sociology of Tsinghua University and conducted a survey of urban economy. In 1935, he served in the Executive Yuan of the National Government, and returned to the Department of Sociology of Tsinghua University in 1947 His main works are: "Social Organization" (1929), "Urban Sociology" (1929), "The Biological Basis of Society" (1931), "The Fourth Way Out of the State" (1936), "After the Disaster" (1947). After 1952, he taught at the Department of Economics of Renmin University of China for a long time. In 1957, Wu Jingchao was mistakenly classified as a famous rightist in sociology (1). In his representative work "The Fourth Way Out of the State", Wu Jingchao put forward the theory of "developing cities to help the countryside". He divided the world into four countries according to the two criteria of population density and occupation. He believes that China belongs to the fourth country. The way out is: to make full use of domestic resources; to improve production technology; to implement fair distribution; to control the population, and to advocate "the use of mechanical production methods to replace the production method of muscle". He is one of the earliest representatives of urban sociology in Chinese sociology, focusing on the study of society from an economic perspective, especially urban society, and also exploring issues such as ideal cities. Wu Jingchao is one of the earliest representatives of urban sociology in Chinese sociology. He focuses on the study of society, especially urban society, from an economic perspective. In his book "Urban Sociology", he clarified the research scope of urban sociology, introduced the research methods of western urban sociology, and clearly defined the difference between the two concepts of "urban area" and "urban area". He believed that urban area not only includes the city itself, but also includes dependencies outside the city, and urban area mainly refers to the situation of the city itself. He also further discussed the ideal city and other issues.