A prospective esophageal manometry using the high-fidelity recording equipment was performed in 35 healthy Korean. The manometric data of this study showed: 1) 3.4(+-0.67)cm for LES length; 19.8(+-7.05)mmHg for LES pressure; 7.43(+-2.21) sec. For the relaxation time of LES; 21.9(+-2.7)cm for the length of esophageal body; 28.3(+-13)~ 55.7(+-11)mmHg for the amplitude of esophageal contractions; 3.2(+-0.6)~3.8(+-1.0)sec. For the duration of the contraction waves; 3.1(+-1.2)~6.6(+-2.3)cm/sec. For the velocity of the contraction waves; 2.6(+-0.9)cm for UES length; 0.95(+-0.3)sec. For the relaxation time of UES, 2) Radial pressure asymmetry of the LES was observed. The highest pressure occurred in the posterior direction and the lowest pressure in the right direction. 3) Abnormal esophageal responses to swallowing including aperistalsis, breaking waves, simultaneous contraction, spontaneous contraction, double peaked contraction and repetitive contraction were observed rarely in healthy subjects.