In the thirty years after the founding of the People Republic China, until the reform and opening up, the Danwei compound was the main element of the urban space in China, and the main method of urban spatial layout expansion. As the capital, Beijing is the origin and concentrated expression of the Danwei system. If the old Beijing city is composed of Siheyuan, then the new Beijing city is constituted by the Danwei compound. With the transformation of the economic system, the Danwei compound gradually declined and disintegrated. Firstly, the thesis introduces the relevant concepts and characteristics of the Danwei compound, and then introduces the basic situation of the Danwei compound in Beijing, including investigating and drawing the evolution of the overall spatial distribution of the Beijing Danwei compound, and the basic spatial layout of the compound in different functional categories.