Objective To investigate the current situation of mental health of high school seniors and the relationships between mental health and parenting style,peer relationship,teacher-child relations. Methods A total of 600 high school seniors in He'nan was surveyed by symptom cleck list-90(SCL-90),Egna Minnen Barndoms Uppfostran(EMBU),the Scales of teacher-child relationship satisfaction and peer relationship satisfaction.Results 1)The detection rate of mental health problems of students senior 3 was serious(X≥3).2)There were negative correlations between positive parenting style,teachers' expectation,support,care,encouragement,satisfaction of peer relationship and each factor of SCL 90(P all＜0.05).3)Satisfaction of peer relationship had the most influence on high school seniors' mental health(6.5%),then was the satisfaction of teacher-child relationship(3.5%) and the mothering pattern(2.1%); at the same time the satisfaction of teacher-child relationship affected mental health through satisfaction of peer relationship. 【Conclusions】 The mental health level of high school seniors is low.The satisfaction of peer relationship,the satisfaction of teacher-child relationship and the mothering pattern predict mental health significantly(10.9%).