Abstract: Since the late Qing Dynasty began to develop the Constitution, the development of constitution has lasted a century in China. A total of 17 constitutions or constitutional documents have been issued. Through an empirical analysis of the constitutional texts, people are classified by the constitutions into three categories:political category, legal category and special category. Although these three categories exist in all the seventeen constitutions of our country, they do not enjoy the same status. And the sub-categories of these three categories have experience a change in order, from "monarch-subject" to "people-enemy",from "national-non-national" to "citizen-non-citizen",and from "physiologic factor" to "national factor" and to "occupation and risk factor"; the successive expansion of each subclass reflects the clear logical dimension of history. That's the evolution rule of "internal iterative replacement and external emphasis shift" contained in the three classifications, and the profound changes of the constitutional idea of "political law-legal law-welfare law" and even the jurisprudence idea of "inequality-formal equality-substantive equality" embodied behind it.