Abstract: “German Ideology” is one of the main works during the formation of the Marxism and it is the foundational work of historical materialism. Because “German Ideology” discusses human and society by investigating “persons in reality”, their production and living, historical materialism can reveal the deep essence of history. So, we may say that the theory about human is the soul of historical materialism. Compared with “Economic and Philosophical Manuscripts of 1844” and other early works of Marxism, “German Ideology” proposed a deeper understanding on the mode of thinking, theoretical foundation, and concrete contents on human. Whether for the theory development or the construction of socialism, it is very important to study the human theory in “German Ideology”.