Socialism has gone through a process from theory to practice, and theory and practice hand in hand during its development of more than 500 years. Xi Jinping Thought on Socialism with Chinese Characteristics for a New Era is a result of the development of socialist theory and practice. There are inherent logical connections and consistency between them both in theory and practice. Through combing the connections and consistency, this paper reveals that Xi Jinping Thought on Socialism with Chinese Characteristics for a New Era is an inevitable result of the development of socialism in China and the latest achievement of Sinicization of Marxism. It also shows that Xi Jinping Thought on Socialism with Chinese Characteristics for a New Era is an innovation of Marxism and its socialist theory.