唐代社会阶层结构变革：由贵贱到贫富

唐代中叶，一个新兴的阶层——富民阶层崛起。由此，中国古代社会的阶层结构出现转型，由身份等级制向以财富为标准的贫富转化。富民作为“民”无权将佃农沦为自己的依附民，而只能依靠财富的力量。以契约形式利用佃农的劳动力。这样，在法律身份平等基础上的一种新型的契约关系成为主导。唐代社会阶层结构的变革对国家政策、制度产生了深远影响，标志着中国古代社会由前期向后期转型。

Change of Social Strata Structure in the Tang Dynasty： from Hierarchy Standard to Wealth Standard

In the mid - Tang Dynasty, a new class - rich civilian class - rose. From then on, the ancient Chinese social class structure began to change from hierarchy standard to wealth standard. The rich civilian class had not the right to take tenant farmers as their subordination. They can only use the tenant farmers＇ labor by the power of wealth and form of contract. In this way, a new kind of contractual relationship basing on the equal legal status became dominant. Change of social strata structure in the Tang Dynasty had important impact on national policy and marked the ancient Chinese society＇s transition from the early period to late period.