1. The first integration of Marxist theoretical system was realized on the basis of its basic position, and its main symbol was the completion of 1844' s Economic Philosophy Manuscript. This integration is based on three changes.

2. The second integration of Marxist theoretical system was realized on the basis of the establishment of its philosophical methodology, and its main symbol was the publication of the Manifesto of the Producers' Party. The foundation of this integration is the philosophical revolution and the initial establishment of economic theory.

3. The third integration of Marxist theoretical system is realized on the basis of its economic theoretical system, and its main signs are

The publication of Das Kapital 1. This integration is based on the all-round development of theory, especially the development of political economy.