Using one hundred monosyllables which represents Korean speech sounds, the author has studied articulation scores and confusion patterns of normal listeners in sound proof and various noise (white and speech) sircumstances and of those with hearing loss (conductive, mixed and perceptive). The results revealed as follows : 1) The tendency of confusion patterns was almost same in all test groups : confusion occurred among initial consonants, vowels and final consonants, respectively according to their distinctive features. 2) In both group of perceptive hearing loss and normal under ralatively intense noise circumstances, articulation function was same ; both showed many kinds of confusion patterns and poor articulation scores. 3) Initial consonants were most frequently confused and vewels least in the groups with poor articulation scores. 4) Though confusion patterns of each phoneme varied with test conditions in the same test group, confusion patterns, generally, appeared according to its phonetic characteristics. 5) Confusions among the phonemes which differ each other in phonetic quality occasionally occurred only in group with poor articulation scores. 6) Articulation scores were same in white and speech noise at 30 dB noise level, but more poor in speech noise than white at the level of 50 dB.