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From the perspective of human geography, Dongxicheng is a political, cultural and economic intensive area in Beijing, where major party and government organs and ministries are located. Before liberation, it was always a gathering place for upper-class literati, with profound cultural background, strong atmosphere and good humanistic environment. Before liberation, Chongwen Xuanwu, a geographical "South City", was inhabited mostly by the children of the Eight Banners who were in decline, and some backward singing and dancing places were located around the homes of the children of the Eight Banners who were caged birds. Of course, there are many famous time-honored brands in Beijing, such as Liulichang, which specializes in antique home appliances and celebrity calligraphy and painting. This seems to be the reason why old Beijing said that "the east is expensive and the west is rich and the south is poor and the north is cheap".
From the perspective of physical geography, there are Yanshan Mountain in the north and Xishan Mountain in the west of Beijing, which can resist the desert sandstorm from the Mongolian Plateau. According to the statistics of a professional meteorology named "Wind Rose" in the city rules, most sandstorms encountered in Beijing are northwest winds, and Beijing has the characteristics of high northwest and low southeast. So sandstorms attack from northwest to southeast. The sandstorms in the north are blocked by mountains, but there is no shelter in Cheng Nan. Water flows from the high-lying northwest to the low-lying southeast, and the north is upstream, with clear water quality. As the downstream, the south has poor water quality and seeps underground. Then the soil is not good, so the south of Beijing has become a "downwind image" and an "underwater image" in terms of geography and architecture, so the real estate price in Cheng Nan, Beijing is relatively low. In view of this, Cheng Nan has intensified its planning and construction, and successively issued a series of preferential policies to adjust the urban population distribution. For example, the price in Cheng Nan is low, and several traffic lines can be extended to reach Cheng Nanjian's large shopping mall; The real estate rooms in Cheng Nan are first-class in layout, area and style. In Cheng Nan, Beijing-style time-honored brands are relatively concentrated, such as Zhang Yiyuan tea in Xuanwu District, Chinese medicine in Deshoutang, silk in Qianxiangyi, calligraphy and painting in Rong Baozhai, ink and wash in Yidege, books in Laixunge and Songyunge, Tongrentang Chinese medicine in Chongwen District, Zhengmingzhai cake, Long Yuan silk, Quanjude roast duck and Longshuncheng furniture 18 time-honored brands.