As one of the early advanced intellectuals spreading Marxism in China,Cai Hesen not only firmly chose Marxism on the road of exploring the truth of saving the country,but also strongly defended Marxism in the debates with various social ideological trends.Furthermore,combining Marxism with the reality of the Chinese Revolution,he innovatively proposed establishing CPC's own theory and he himself formed a series of revolutionary theory.He has become a well-deserved pioneer in advancing the modernization of Marxism in China.His scientific attitude towards Marxism has important practical enlightenment for upholding and developing Marxism in the new era.