Abstract: For developing socialism with Chinese characteristics，enriching the practical and theoretical features，and the national and epoch features of the socialism with Chinese characteristics is of urgent significance. This has been proposed in the 18th CPC National Congress. The theoretical characteristic，which is scientific，innovative and consistent，is the guidebook of socialism with Chinese characteristics. In practical term，socialism with Chinese characteristics is exploratory，pragmatic and is of affinities with the masses，which is the developmental foundation of socialism with Chinese characteristics. Theory derives from practice，and develops and gets enriched in the process of guiding practice. Practice is the source of the theoretical innovation，and drives the theory to develop. Secondly，the aggressiveness of practice and the expansibility of theory build upon each other in the dialectical development of socialism with Chinese characteristics. In conclusion，constant enrichment and development of the theoretical and practical features of socialism with Chinese characteristics are the inherent requirements for building and developing the socialism with Chinese characteristics.

Key words: socialism with Chinese characteristics, Mao Zedong Thought, Deng Xiaoping Theory, the important thought of ”three represents”, scientific outlook on development