The purpose of the this study was to establish preliminary data on the characteristic of dysfluency in monologue. The subjects were 30 normal speaking adults(15 males and 15 females), aged from 18 to 30 and 30 normal speaking children, aged from 8 to 10. This study attempted to sample 1-minute portion of talking about the daily routine. Videotapes were made to analyze his/her speech sample in terms of the patterns and the frequency of dysfluency. The result of the present study were a follows: (1) The children had total dysfluency type ratios of 12.48%, dysfluency type ratios of 2.83%. Interjection was the most frequently occuring, followed by revision, incomplete phrase. (2) The adults had total dysfluency type ratios of 8.51%, dysfluency type ratios of 0.59%. Interjection was the most frequently occuring, followed by revision, syllable repetition. (3) In adults, both total dysfluency type ratios and dysfluency type ratios differed significantly by the gender. (4) Both total dysfluency type ratios and dysfluency type ratios differed significantly between adults and children.