Abstract: Common prosperity in the new era emphasizes the need to "promote common prosperity to make more obvious substantive progress", and presents the scientific implications of "why to promote", "what to promote", "who will promote" and " how to promote". On the "why to promote", it is mainly a realistic consideration of "promoting common prosperity to make more obvious substantive progress"; In terms of "what to promote", it focuses on the scientific connotation of "promoting common prosperity to make more obvious substantive progress". On "who will promote", it is emphasized to combine the top-level design of the Communist Party of China, the government governance, and the innovative practice of the people. The "how to promote" includes the overall promotion at the level of thought, system and means.