The Opium War in 1840 ushered in the era of semi-feudal and semi-colonial society in China. The capitalist invaders forced the Qing government to sign a series of unequal treaties, helping them open the door to China, which led to the development of commerce and trade in the coastal port cities. Against the background of “Westernization Movement”, national capitalism also developed to a certain extent, leading to the rapid development of the industrial and commercial cities along the coast.