Shikumen buildings are the main form of residential buildings for Shanghai citizens. After Shanghai opened its port in 1864, the Eastern and Western cultures merged rapidly, and domestic and foreign trade became increasingly prosperous. As a new oriental commercial city, a large number of gold diggers poured in, causing unprecedented tension in Shanghai's urban housing. In order to meet the needs of living, a new type of building, Shikumen, which combines Western culture and the characteristics of traditional Chinese folk houses, emerged. Shikumen originated in the American Concession in Hongkou, matured in the British and French Concessions in the southwest of Shanghai, and then quickly crossed the Huangpu River to the northwest. By the 1960s, there were about 200,000 Shikumen buildings in Shanghai. According to the "Shanghai Residential Architecture Records" published by the Shanghai Academy of Social Sciences Press in 1998, the number of Shikumen in Hongkou reached 23,316, accounting for as much as 1/10 of the total number in Shanghai. Among them, there are about 3,200 old-style Shikumen, 5,300 new-style Shikumen, and 14,800 Cantonese-style Shikumen. The compact and multi-partitioned space of Shikumen meets people's living needs. From the mid-20th century to the mid-19th century, according to statistics, 40% of Shanghai people lived in Shikumen, and the population of Shikumen in Hongkou reached about 480,000, accounting for 3/5 of the total population of Hongkou. Shikumen is a unique residential style in Shanghai, and it is also an important source for Shanghai to form its own unique lifestyle and cultural style. In modern times, Shikumen in Shanghai once created a large number of well-known writers who recorded the living and creative status of cultural people in the last century. A large number of distinctive Shanghai citizens' lifestyles and cultural styles were also produced in Shikumen, a unique residential style, and the alleys formed by it. They constitute a large number of Shikumen cultural customs with distinct Shanghai citizen cultural colors, as well as corresponding cultural space forms full of various citizen life styles. Specifically, Shanghai's Shikumen customs mainly include the following aspects: Shikumen life customs, such as living style, neighborhood relations, and secular slang; Shikumen business customs, such as alley vendors and alley hawking; (3) Shikumen entertainment customs, such as alley opera, alley folk art, and alley games. The life customs produced in Shikumen are a way of life full of Shanghai citizens' characteristics, fully reflecting the cultural characteristics of Shanghai people, such as shrewdness, pragmatism, openness, and practicality; the hawking customs produced in Shikumen are the product of the typical urban hawker economy, with the characteristics of the urban commercial operation model of the last century. The entertainment and game customs produced in Shikumen are a unique way of entertainment and leisure produced in Shanghai's Shikumen space, which reflects the main form of cultural entertainment of Shanghai citizens in the last century. The slang language in Shikumen customs and culture is the language tool for Shanghai people to communicate in the last century, which fully enriches the language library of Shanghainese. In short, Shanghai's Shikumen customs originated from the unique living environment and cultural background of Shanghai people. It is an important manifestation of Shanghai's civic culture, and also a concrete reflection of Shanghai people's cultural psychology and values.