Objective: To explore the coping style of high school students and its relationship to mental health. Methods: Make a survey upon 320 students through coping style questionnaire and MSMH. Results: High school students often resort to problem solving and appeal to coping factors. No distinct gender difference is found in coping style. There are different degrees of correlation between coping style and mental health. Remarkable grade difference is shown in the factor of appealing in coping style and the three factors of compulsion, anxiety and mental imbalance in mental health. Conclusion: Relatively mature coping style has come into existence among high school students, but more guidance and assistance are in need in cultivating the coping style and improving the mental health.