Abstract: The evolution of the principal contradiction is the main basis for proposing the idea of the new development stage. The new development stage is not detached from the primary stage of socialism, but is a key stage in the advancement of it. The new development philosophy is developed based on the new development stage, and the new development stage must implement the new development ideology; the new development stage is the precondition and inevitable requirement of building a new development pattern, which, in turn, is the core strategy to achieve the goal of the new development stage. Achieving the rejuvenation of the Chinese nation is both a glorious and arduous mission of the Party and the people in the new stage of development, which is a decisive stage to achieve national rejuvenation.

Key words: the new development stage, the primary stage of socialism, the new development philosophy, the new development paradigm, political economy with Chinese characteristics

摘要： 社会主要矛盾的历史性变化是提出新发展阶段的主要依据。新发展阶段并未脱离社会主义初级阶段的时代定位，而是社会主义初级阶段向更高阶段迈进的关键阶段；新发展理念以新发展阶段为基础，新发展阶段必须贯彻新发展理念；新发展阶段是构建新发展格局的前提条件和必然要求，新发展格局是实现新发展阶段目标的核心战略。实现中华民族伟大复兴是党和人民在新发展阶段的历史使命，新发展阶段是实现中华民族伟大复兴的决战决胜阶段。

关键词: 新发展阶段, 社会主义初级阶段, 新发展理念, 新发展格局, 中国特色社会主义政治经济学