Abstract: High-quality development is a brand-new theoretical problem faced by development economics with Chinese characteristics. After my country’s economy turns to high-quality development, it is necessary to answer “why turn to high-quality development and what is high-quality development, how to turn to high-quality development” three major theoretical issues. These three major theoretical issues involve the objective inevitability of shifting to high-quality development, the goal and evaluation system of high-quality development, the transformation of development mode shifting to high-quality development, structural upgrading, power conversion and the new development pattern based on dual cycles Construct six propositions.The shift of my country’s economy to high-quality development is an inevitable requirement for adapting to the changes in the main contradictions of my country’s society, creating an upgraded version of China’s economic development, and following the laws of economic development. The strategic goal of high-quality development is to promote the transformation of development mode, promote the upgrading of industrial structure, promote the conversion of new and old momentum, and build a new development pattern. In the evaluation system, a high-quality development evaluation system must be established. The shift to the stage of high-quality development must promote the transformation of development methods and realize the shift from catching up with quantity to catching up with quality. Promote the upgrading of the economic structure from the two aspects of the upgrading of the industrial structure and the upgrading of the consumption structure, and promote the transformation of power, and cultivate new drivers of high-quality development. In the new development pattern, promote the formation of a new development pattern in which the domestic and international cycles are the mainstay and the domestic and international double cycles promote each other.