Objective To explore the current situation and influencing factors of adolescent mental health in a district of Chongqing

and to provide a reference basi.s for the targeted development of adolescent mental health education.Methods Using a multi-stage stratified whole-group sampling method

2 360 adolescents in a district of Chongqing weresurveyed using the Mental Health Inventory of Middle School Students（MMHI-60）.Results The detection rate of psychological problems among the survey respondents was 38.9%

mainly manifested as emotional instability（55.0%）

compulsion（53.0%）

academic stress（49.3%）

anxiety（46.7 %）

and sensitivity to interpersonal tension（46.0 %）.The detection rate of psychological problems increased sequentially among upper elementary school students（15.9 %）

middle school students（45.3 %）

and high school students（47.5%）.The mean scores of the MMHI-60 total and its subscales（compulsion

paranoia

hostility

sensitivity to interpersonal tension

depression

anxiety

academic stress

maladjustment

emotional instability

and psychological imbalance） of the survey respondents were 1.93±0.58

2.06±0.63

1.86±0.69

1.80±0.76

1.97±0.70

1.88±0.72

2.03±0.84

2.10±0.87

1.85±0.67

2.13±0.74

and 1.64±0.63.In terms of gender characteristics

girls had significantly higher mean scores for the MMHI-60 total score and for the compulsion

hostility

sensitivity to interpersonal tension

depression

anxiety

and emotional instability subscales than boys（P<0.05）;in terms of school section characteristics

high school and middleschool students had significantly higher mean scores for the MMHI-60 total score and all of its subscales than elementary school students

and high school students had significantly higher maladjustment

depression

academic stress

and anxiety than middle school student;regarding the characteristics of high school class type

the mean scores for the MMHI-60 total score and each of its subscale were significantly higher among students in regular classes than among students in key classes（P <0.05）;on the characteristics of family structure

the mean scores for MMHI-60 total score and the emotional instability

maladjustment

depression

paranoia

and psychological imbalance subscales were significantly higher among students living with one parent or grandparents than among students living in intact families（P<0.05）.Multifactorial unconditional logistic regression analysis revealed that junior high school（OR=4.15）

senior high school（OR=4.78）

single parent family（OR=1.46）

and general class（OR=2.04） were risk factors for the mental health of the survey respondents（P<0.05）.Conclusion Psychological problems are more prominent in adolescent groups

and family and school are important factors affecting adole scents’ mental health.Schools need to consider the students’ school section

class type

and family structure to carry out mental health education.