To study the personality characteristics of alcoholic patients, they were screned with the MAST(Michigan Alcoholism Screening Test) and administered with the MMPI (Minnesota Multiphasic Personality Inventory) in the Dept. of Neuropsychiatry, Oriental Medical Hospital in Kyung Hee Univ. form March 1991 to June 1991. Patients admitted for alcoholism were examined and analyzed using the above tests and then studied by Sasang Constitutional approach. Results were as follows; 1. In the MAST score, the cases of obvious alcohol dependence was 53.3% and overall mean score was 28.1 point. 2. In the MMPI scale, the mean of the T-scores for 2(D)-4(Pd) profile was high, but it was not statistically significant. 3. The results obtained by multivariate cluster analysis of MMPI T-scores can be divided into 3 subgroups; 1) 9% showed the psychiatric tendency of F-6(Pa)-9(Ma)profile, 2) 44.2% showed no significant profile, 3)46.5% showed the neurotic tendency of 1(Hs)-2(D)-3(Hy)-4(Pd) profile. 4. Since 44.2% showed no significant profile on the MMPI, much more alcoholic patients were caused not by personality factors but by social tolerance, and also by increasing apportunities of drinking in Korean society. 5. When analyzed with Sasang Constituional approach, 1) for the Soyangin (少陽人): 6(Pa) scale was particularly high, 1(Hs) and 3(Hy) scales were low compared to others, 2) for the Taiumin(太陰人): 1(Hs)-2(D)-3(Hy)-4(Pd) neurotic profile was high, the K-scale and 4(Pd)scale were high compared to the Soyangin, 3) for the Soumin(少陰人): 1(Hs)-2(D)-3(Hy)-4(Pd) neurotic profile and 7(Pt) scale were also high.