Concentrating on the recent discussions about the Concept of Scientific Development since the Eighteenth National Congress of the CPC and the formation of Scientific Development Theory, from the perspective of the sinicization of Marxism, the thesis states the important role of the "people-oriented" characteristic of the Concept of Scientific Development in the theoretical system of socialism with Chinese characteristics. The paper also analyzes the theoretical origins of the Concept of Scientific Development, explains the most distinctive spirit of the Concept of Scientific Development since the Eighteenth National Congress of the CPC, and from the perspectives of the "core idea", "character theory" and "theory of form", the thesis studies the connotation and significance of the Concept of Scientific Development, as well as its theoretical contribution on "Chinese Socialism Theory". The Concept of Scientific Development is not only the latest achievement of the sinicization of Marxism, but also a guide to building a moderately prosperous society and a modern enterprise.