Liberation of man is the purpose of basic value of Marxist system. On the basis of main symptom examining the realistic life critically, the self-liberation of proletariat as a historical premise, and the negative dialectics as a basic way, Marx’s theory of liberation becomes an essential logic structure of the subject and object, the theory and practice, the past and future in life world. Firstly, Marx’s theory of liberation opened a practical way to study liberation of man in view of the dialectical relationship of man and nature, society and culture. Secondly, Marx’s theory of liberation, based on “realistic and living individuals” and dialectical unity of advanced development of production and actual liberation of man, clearly presents the principle of life. Thirdly, breaking away from the bondage of natural relations, social relations and cultural views, is an internal logic of Marx’s theory of liberation in practice.