The theoretical system of socialism with Chinese characteristics is new generalization of the theoretical achievement about China localization of Marxism and is a new title of Chinese communist guiding thoughts and is defined by main contradictions and basic tasks at initial stage of socialism and experiences the process from exploration and creation to development and is a continuously developing and open theoretical system including Deng Xiaoping Theory, Three Represents, and scientific development outlook and so on. The generalization of the theoretical system of socialism with Chinese characteristics avoids the defects of two kinds of nomenclature of guiding thoughts of Chinese communists and rationalizes the relationship between each theoretical result and is a guiding line for Chinese communists to stick to forever in the initial stage of socialism.