Deng Xiaoping’s “Southern Talk” not only continued to interpret “what Marxism is and how to learn Marxism” but also answered “what socialism is and how to construct socialism”, meanwhile, laid the theoretical basis for such two propositions as “what kind of the Party should be build and how to build the Party” and “what kind of development should be realized and how to develop”, which are the key to forming and developing theoretical system of the socialism with Chinese characteristics and which are a key link and an important part of Marxism Chinalization. 