Since the reform and opening up, hundreds of thousands of farmers from mountain villages have poured into the mountain city with bamboo poles in hand, helping citizens to carry heavy loads, carry heavy loads on their shoulders, and climb up the hills, bringing vitality and noise to the city. The disorderly labor of this "bangbang army" constitutes a special working class, which is convenient for citizens and also brings troubles to the city. There are no luxurious scenes and profound economic reform activities, but it actually reflects the surge and changes of ordinary people. The "bangbang army" will eventually disappear with the pace of reform, but it cannot be avoided to leave a heavy mark on the reform of the mountain city. Chongqing's main urban area is built on the mountain and it is necessary to climb up the hills to walk through the streets and alleys, but look at the current Chongqing people who still live freely and easily. This cannot but mention Chongqing's uniqueness. In the streets and alleys of Chongqing, you can see groups of rural people in groups of three or five, each holding a stick in their hands. They are called the bangbang army. The business scope of the bangbang is as large as the large items of the owner such as furniture and home appliances. As small as one or two small dishes bought by citizens, the price is also casually shouted, and the price is finalized in a few words. The cargo owner waves his hands in front, and the bangbang carries the cargo and follows closely. Chongqing people are not afraid that the bangbang will steal the goods. Most of them are honest and trustworthy, and have their own professional ethics. They work from the countryside to the city with their own hands. Their hard work provides convenience for thousands of households. Today in the new era, the bangbang has gradually undergone a qualitative change, from scattered soldiers to collectives. Some collectives have participated in the standardized training of employers, engaged in physical labor activities of employers, and unified clothing and management. There have also emerged touching deeds of helping women, children, the sick and the weak, and acting bravely, which are talked about with relish by the people of the mountain city.