Abstract: Zhang Yibing holds that the Brussels Notes and Manchester Notes are Karl Marx’s important notes of his second systematic study on economics, and they are also the experiments of economic thought at the eve of the birth of historical materialism on a broad sense. But in the past days’ studies we did not lay sufficient importance on these texts, and the translation is also scarce. It is of important significance for understanding the formation of the broad-sense historical materialism through understanding these texts’ writing process and their theoretical connotation. Zhang Fugong proposes, through his study on Brussels Notes, that the historical revolution of the mode of production evinced by large-scale machine industry constituted one of the inner motives of Karl Marx’s turn from philosophical-humanistic discourse to the discourse of material production starting from objective reality. A deeper text-reading based on MEGA2 to Brussels Notes will be helpful for us to deeply understand the ideological origin and formation logic of Marx’s philosophical revolution. Kong Weiyu believes that Brussels Notes is the important spot of Marx’s discourse of production. Firstly, it announced his retreat from the discourse of labor and transfer to the discourse of production; Secondly, it made Marx to see the important function of material production as basis and premise; Thirdly, it constructed the foundation of methodology to penetrate the wholesome development of social history through relationship production in his broad-sense historical materialism. Wu Ting proposes that Marx in his Manchester Notes continuously concerned with the bourgeois material production process, and he acknowledged that, in the system of modern industry, the material production not only created a new historical relation between humans and the nature, but also created fundamental change in human social relation and its structure. Such a “production discourse” starting from reality put an end to the prior humanistic logic of value critique, and becomes an important clue to grasp Marx’s new source of world view.