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Purposes: To perform successful aortic valve plasty (AVP) and valve-sparing root replacement (VSRR), a sufficient understanding of the aortic root and cusp geometry is required. Several key parameters of the aortic root and cusp geometry were, therefore, measured intraoperatively., Methods: Forty-nine patients (63.1 ± 16.6 y.o., 40 males) were measured during the surgeries. The patients were divided into 3 groups; including patients with no or mild aortic valve regurgitation (AR) (n = 13), moderate AR (n = 18), and severe AR (n = 18)., Results: There were no significant differences in the body surface area (1.72 ± 0.19 m 2 ) among the 3 groups (p = 0.858). The effective height (EH) and geometric height (GH) of right coronary cusp were smaller than those of the others (EH: p = 0.068, GH: p < 0.01). The insertion line length (ILL) and free margin length (FML) of each leaflet tended to be significantly longer according to the AR grade(ILL: p < 0.01, FML: p < 0.01). The FML/AVJ ratios were significantly different (p < 0.01). The FML/ILL ratios were constant with the ratio of 0.88 ± 0.1(p = 0.624)., Conclusions: Although the ILL and FML tended to increase with the AR grade, the FML/ILL ratio remained constant. For successful AVP and VSRR, adequately maintaining the FML/ILL ratio is necessary to prevent remarkable cusp prolapse while also preserving its favorable cusp motion.