Betel nut trade: According to Guo Shengsheng, betel nut has played an important role in the social life of southern China. The trade volume of betel nut is also very large, covering a wide range, not only in domestic provinces, but also involved in import and export trade. During the late Qing Dynasty and the Republic of China, according to the "Historical Materials of China's Old Customs", there were more than 30 ports for the import and export of betel nuts in China, covering Liaoning, Tianjin, Henan, Jiangsu, Shanghai, Fujian, Zhejiang, Sichuan, Hunan