Since the 1980s, along with the reform of the rural household contract responsibility system as the main propulsion and the start of the economic system reform, towns in rural area of light years of surplus labor began to flow to the town, from the Midwest economically underdeveloped areas flow phase. In terms of gender, the floating population is mainly composed of male rather than female. The rural population flowing into cities is dominated by males (both unmarried and married) and unmarried women, while married women mostly remain in rural families. In the essay, the married women who go to cities to work or do business and stay in the countryside are called left-behind women.