An investigation has been made on 468 senior high school students, with the help of the adolescent self-evaluation counting of the daily events known as ASLEC, and a questionnaire about the mental health, and the sense of happiness. The study shows that their mental health is good in general, satisfaction of life slightly above average, sense of happiness over friendship and family quite obvious, sense of academic achievement relatively low. In addition, life event may result in substantial impact on their mental health and subjective sense of happiness. Moreover, the existing influencing factors to their mental health include pressures, depressions, other life events, satisfaction of freedom, sense of family happiness, interpersonal relationship, enthusiasm, penalties, and healthy adaptations.