乡村城市化是人类社会发展的必然趋势,是农业社会向工业社会转化的基本途径,也是衡量一个地区经济发展和社会进步水平的重要标志。据联合国预测,到本世纪末50％的人口将生活在城市。目前发达国家的城市化水平已达到80％～90％,发展中国家平均水平也达到 Rural urbanization is the inevitable trend of human society development, the basic way for agricultural society to transform into industrial society, and an important symbol to measure the economic development and social progress of a region. According to the UN forecast, 50% of the population will live in cities by the end of this century. At present, the urbanization level in developed countries has reached 80% to 90%, and the average level in developing countries has also reached