Abstract: Da Hang: was an organization of roughnecks that first appeared in Jiangnan during the late Ming and early Qing. The appearance of the Da Hang was related to a sharp increase in the floating population, the prosperity of market towns, the changing social structure, the “violent” demands of gentry landlords, and the rise of mercenary system, among other factors. Although the Da Hang belong to the darker side of society, but it also revealed the development of commodity economy in Jiangnan.