The measurement of most comfortable level(MCL) and uncomfortable level(UCL) is a technique that is used in audiologic clinics for a variety of purpose. In the present study, it was aimed to provide basic data on MCL and UCL, to explore some factors that can affect MCL and UCL, and to lay foundation for future studies of MCL and UCL. And the measurement of MCL and UCL by Békésy audiometry in 112 healthy Korean between the age from 17 to 68(mean age 31.7years) was done. The result obtained were as follows. 1) There was a significant difference(p<0.01) between MCL for continuous tones(average 45.5±13.0dB) and for interrupted tones(52.2±21.9dB). 2) There was a significant difference(p<0.05) between MCL for 500Hz(48.6±11.2dB) and for 1000Hz, and also significant differences(p<0.01) between MCL for 500Hz(48.6±11.2dB) and 2000Hz(43.3±13.6). 3) According to age, MCL for 3rd decade was lowest and for 4th decade was highest in average for both stimulus modes. 4) There was a significant difference(p<0.01) between UCL for continuous tones(average 92.5±17.3dB) and for interrupted tones(98.2±16.7dB). 5) There was a significant difference in continous(p<0.05) and interrupted tones(p<0.01) between UCL for male andfemale groups. 6) According to age, UCL for 4th decade was highest and for 7th decade was lowest in average for continuous tones. For interrupted tones, UCL was highest for 3rd decade and lowest for 7th decade.