The authors investigated the relationship among stress, mental health and academic performance of high school students(322 males and 320 females). using stress questionaires and Korean version of SCL-90-R. The problem related to academic achievement was highest stressful. The percent of disturbed subjects was 30.68% Interpersonal sensitivity(12.4% ) in the male and depression(15.6%) in the female were prevalent mental health problems. The scores of the stress questionaire positively correlated with the SCL-90-R scores. It suggests that stress is highly related to mental health problem. However, there was no significant correlation between the academic records and SCL-90-R scores. The results were discussed with respect to adjustment problems of the high school students, and implications for prevention and educational program were suggested.