To understand and implement such guidelines necessitates aiming at theory-based practice and efforts to achieve the goal of building a well-to-do society.

In accordance with the practical theory of Marxist,human thinking and concepts in fact is built on the practical activities,which are achieved by the objective activities——labor.

The Idea of Scientific Development is the Application and Development of Mao Zedong s Thoughs,which applies and develops Mao Zedong s theory of man in aspect of theory of man,Mao Zedong s thought of practical rationality in practical theory,Mao Zedong s methodological thought of paradoxical identity and making overall plans and taking all factors into consideration and.

The principals need to improve the practical theory in their ed ucational leadership in order to bridge the gap between theory and practice.

By distinguishing two different kinds of concepts of practice,Althusser summed Marxist philosophy as"the theory for theoretical practice"and proved the necessity and theoretical significance of such defining.

Having reflected upon "the theory for theoretical practice’’,Althusser reached his new definition of Marxist philosophy which termed by himself "the class struggle in the field of theories",contained the contents such as the class nature,party spirit,development character and value nature of philosophy.