人口向大城市主要是都城的流动与集中,是由唐到宋城市发展变化的主要特征。唐朝以都城长安为代表的大城市在膨胀过程中出现两种趋势,一是大量的流散劳动力涌向生存机会更多的长安、洛阳、扬州等大城市,二是随着商品经济和城市社会的发 The flow and concentration of population to major cities, mainly capital cities, are the main characteristics of the development and changes of the city from Tang to Song dynasties. In the expansion process, there are two trends in the big cities represented by Changan in the Tang Dynasty. First, a large number of migrant workers flock to large cities such as Changan, Luoyang and Yangzhou that have more chances of survival. Second, with the development of commodity economy and urban society The hair