To investigate the relationship between locus of control and adjustment problems, 180 junior high school students were given both the Nowicki-Strickland´s Locus of Control Scale and Mooney Problem Check List (Junior High School Form). In addition, the subjects scoring higher than one standard deviation above the mean were considered as the external control group (ECG) and those scoring lower than 1SD below the mean were the internal control group(ICG). The students whose scores were between ±.5 SD(subscript s) from the mean were assigned to the moderate control group (MCG). The subjects were classified into three groups as mentioned above, each consisting of 60 students(30 boys and 30 girls).The results indicated (1) ECG reported more total problems of concern than ICG and MCG, but no significant sex differences were found, (2) the finding of this study, which indicated that the higher the scores of externality are, the more the problems are among all subjects, is suggestive of a linear rather than U-shaped curvilinear relationship between locus of control and adjustment, (3) there is significant agreement among the ranking of problem areas by three group students, and (4) the major problem areas of concern for junior high school students were "Self-Centered Concerns," "School," and "Money-Work-the Future."