BACKGROUND AND OBJECTIVE: There have been several reports suggesting close relationships bet- ween problem behavior syndrome scale and/or social competence scale and pediatric allergic disorders such as bronchial asthma and atopic dermatitis. The aim of the present study was to confirm these relationships. We compared the behavioral symptoms and social competence scale between allergic and non-allergic patient groups using Korean-Child Behavior Checklist (K- CBCL). MATERIALS AND METHOD: One hundred and seventy-one subjects(aged 4-11 years) were enro- lled in this study. Allergy patient group(N=84) was divided into 4 subgroups, according to the allergic diseases such as atopic asthma(Group 1, BA), allergic rhinitis(Group 2, AR), atopic dermatitis(Group 3, AD), and chronic urticaria(Group 4, CU). Eighty-seven non-allergic patients (Group 5, NA) included those with pediatric general disorders, except psychomotor retardation, neurologic deficit, malignancy or other chronic disorders. K-CBCL which was filled in by parents or guardian, included eight dimensions of problem behavior: withdrawal, somatic problems, anxiety/ depression, social problems, thought problems, attention problems, delinquent behavior, and aggressive behavior. The first three scales were classified as an Internalizing broadband group and the last two scales as Externalizing group. In addition, the questionnaire included social scale, school scale, and total competence scale. RESULTS: There were no significant differences in age, sex, social economic status between 5 subgroups of allergic and non-allergic patients(p>0.05). The mean problem behavior scores tended to be higher in allergic patient group, but no statistical significance was noted(p>0.05). The mean school scale, social scale, total competence scale of allergic patient group were not significantly higher than those of non-allergic patient group(p>0.05). Combined disease group with more than 2 allergic disorders showed problem behaviors compared to non-allergic group or asthma only group. Total social competence scale was lower in allergic patient group with 1-3 years of disease duration than for shorter(less than 1 year) and longer(more than 3 years) durations. CONCLUSION: Taken together, combined disease group and allergic disease group with 1-3 years of duration showed more problem behaviors and the lowest total social competence scales, respectively.