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准确评估冠状动脉狭窄程度在指导冠心病血运重建方面十分重要。近年来，基于功能学评估冠状动脉狭窄对于远端心肌的影响正改变着传统血运重建的理念。血流储备分数指导冠状动脉介入治疗的优势已被临床验证，但因其操作有创、费用较高、检查中应用血管扩张药物副作用较大等原因，在我国应用相对受限。定量血流分数作为一种新型、无创、快速评估冠状动脉功能学狭窄程度的工具，受到研究者的青睐。本文综述定量血流分数的临床研究进展，并展望其未来临床应用。“,”Accurate assessment of the degree of coronary artery stenosis is very important to guide the revascularization of patients with coronary heart disease. In recent years, functional assessment of the impact of coronary artery stenosis on the distal myocardium is changing the traditional concept of revascularization. The superiority of the fractional flow reserve(FFR) in guiding coronary interventional therapy has been widely verified in clinical practice. Due to its invasive operation, high cost, and high side effects of vasodilators during examinations, its application in my country is relatively limited. Quantitative flow ratio as a new, noninvasive, and rapid tool for assessing coronary stenosis, is being favored by researchers. This article reviews the clinical research progress of quantitative flow ratio and prospects its future clinical applications.