Abstract: "Shared development" is one of the five new development ideas in China. It has special practical significance and great historical value under the background of social and historical development. The justification of "shared development" can be proved by the theoretical framework of "human nature-risk". The self-interest nature of human and the secular society resulting from it make the individual potentially threatening. The lack of soft restraint of morality and the absence of hard constraints of law and system make it possible for the individual's potential threat to break out, and then to create a holistic risk that every individual cannot avoid. In order to solve the whole risk,we must adopt mutually beneficial cooperation and the inclusive growth which does not conflict with self-interest human nature. The justification of "shared development" lies in resolving the individual threat and the following holistic risk due to the self-interest human nature and the ensuing secular society through mutually beneficial cooperation and its following inclusive growth based on the foundation of the self-interest human nature.