An introduction to the historical changes of Nan Xincang: Nan Xincang, commonly known as Dongmen Cang, was built on the old foundation of North Taicang in the Yuan Dynasty in the seventh year of Yongle in the Ming Dynasty (1409). It originally stored rice and black beans. Feed etc. At the beginning of the Qing Dynasty, Nanxincang had 30 buildings. Later, there were many additions. By the time of Qianlong, the number had increased to 76. After the mid-Qianlong period of the Qing Dynasty, the country faced financial difficulties. In the late Qing Dynasty, due to the prevalence of corruption, grain reserves were increasingly reduced. By the Daoguang period, the grain storage in this warehouse had decreased significantly compared with that in the early Qing Dynasty. During the Republic of China, the warehouse was converted into an arsenal and is now a Beijing department store warehouse. Due to the frequent increase in new construction in the past ten years, several warehouses have been demolished, and now only 9 warehouses remain.