This study was purposed to introduce Korean Oro-motor Mechanism Screening Examination (KOMSE) and to provide the standardized scores taken from 120 normal adults aged $18{sim}59$. KOMSE was composed of 13 items of structure, 17 items of function, 3 items of voice, and 14 items of regularity and accuracy of articulation during diadochokinesis. Additionally, maximum phonation time and diadochokinetic rates were measured. Total score of KOMSE is ranged from 0 to 200. It was significantly higher in the $50{sim}59$ age group than in the $20{sim}29$ age group, but was not significantly different in sex. MPT had a significant difference in sex, but no significant difference among different age groups. The rate of DDK was also had no significant difference among different age groups. However, some reducing trend in the rate of DDK was observed as age increased. KOMSE would be very helpful for SLPs to screen the abnormality of oro-motor mechanism.