Abstract: Against the backdrop of sluggish global economic recovery, intensified geopolitical risks, technological blockades, and the restructuring of international rules, China's economy faces unprecedented external uncertainties, making certainty a scarce resource. How to maintain economic stability and strategic direction in a complex and volatile international situation has become an important issue facing current development. Centered around the core proposition of“responding to various uncertainties of rapid changes in the external environment with the certainty of high-quality development”, this paper delves into the theoretical basis and historical experience of how high-quality development can respond to various uncertainties, and analyzes the practical sources of certainty in high-quality development from five aspects: Party leadership, transformation of the principal contradiction in society, solid material and technological foundation, high-level opening up, and social consensus. Furthermore, in the context of various uncertainties, we should adhere to and strengthen the overall leadership of the Party, implement the new development concept, stabilize the basic operation of the economy, improve the macroeconomic governance system, persist in seeking progress while maintaining stability, accelerate the construction of a new development pattern, and promote the construction of a unified national market. We can consolidate the foundation of certainty in high-quality development to promote the continuous and healthy development of the economy and society.

Key words: high-quality development, theoretical basis, practical sources, external uncertainties, new development pattern