Abstract: It is the precondition of Communist Party innovating theory and developing practice to scientifically explore and correctly answer “What is Marxism and How to Research Marxism”. Hu Jintao’s main contributions include: he has made high generalization to Marxism essence of “Seeking Truth and Dealing with Concrete Matters”, given “Emancipating the Mind” new connotation and higher thought position, repeated sinicization of Marxism, put forward popularization of Marxism and its innovative theory, etc. Hu Jintao’s exploration and answers greatly deepen our party understanding innovation law of Marxism in contemporary China.