On the Development of Cities in Song Dynasty and Its Impact

After the establishment of Song Dynasty,along with the development of social economy,the urban appearance had also been changed beyond recognition.The cities of Song Dynasty changed the tradition of the separation of community and business in Han and Tang Dynasty,and implemented Xiangfang system.Besides,it broken the long-standing curfew tradition,and enabled the city to achieve the unprecedented prosperousness.The development of cities of Song Dynasty improved local economy,broke through the residential rank fetter,and even dealt with the surplus-labor.But on the other hand,it caused social extravagance,and increased the public security incidents correspondingly day by day.