Hanzhong City makes a lot of money selling hydrogen balloons, especially near the end of the year. Many migrant workers buy things for their children after they come back, but the children have no resistance to hydrogen balloons, have a lot of needs, earn more money, and work flexible hours, which is not tiring.

Hanzhong City, a prefecture-level city under the jurisdiction of Shaanxi Province, is located in the southwest of Shaanxi Province, bordering Baoji City and xi City in the north, Ankang City in the east, Guangyuan City, Bazhong City and Dazhou City in Sichuan Province in the south, and Longnan City in Gansu Province in the west, with an area of 27,246 square kilometers.