With a reviewing on the investigation theory and practice by classic Marxist authors, the paper suggests that those authors emphasize much on investigation, which is a tradition to be carried on, and that it is the base for practicality in politics of the new century, especially when the present subjectivism in politics has seriously hindered social development.

The fair play theory fails to justify political obligation,because it conceptually entails voluntarism,and the public interests can be neither accepted nor rejected voluntarily.

The justification of political obligation and authority has been disputed drastically in modern western political philosophy.

Marcuse throws light on the relationship between reality politics and aesthetics,and pointed the possibility and ideal results of aesthetic activity in establishing social reality.

Network Politics exists independently to reality politics relatively and its root is the particularity reason and constructiveness of politics thinking.

The need for political theories because of the different political practices in the four periods in the Han Dynasty may explain the different focuses in the rewriting of classics.

In a historical point of view,by tracing the steps of Chinese teacher education practice,it is demonstrated that the social political practice has played a role in the constitution of teacher education practice,and the teacher education system transplanted from overseas have influenced the original system.

From researching the origin of the problem of the moral preestablishing on, it redes separately the origin and intension, historical rheidity, the relationship between political practice and the moral preestablishing.