Seeking truth from facts and keeping pace with the times are the living soul of Marx's scientific socialism view. Owing to the limitations of history, the founder of Marxism can not provide a complete answer for how to build socialism. After the death of Marx, scientific socialism left many gaps in the theory and practice. The theoretical innovation and practical innovation of socialism with Chinese characteristics are filling in these gaps constantly. In addition, the Communist Party of China applied and developed the Marx doctrine in the new situation. We must adhere to the correct, orderly, sustainable reform and healthy, scientific, sustainable development, which are the fundamental guarantee to the victory of socialism with Chinese characteristics.