Abstract: ObjectiveTo study the prevalence and epidemiological feature of depression symptoms and associated factors in middle school students of Kunming urban area.MethodsCenter for Epidemiologic Studies Depresion Scale (CES-D),Social Support Rating Scale(SSRS),Middle School Students Coping Styly Scale and self-compiled questionnaire were adopted to investigate 2 150 middle school students.ResultsThe prevalence rate of depression symptoms was 20% (425/2 128).Chi-square tests showed that female students had a higher prevalence rate of depression symptom than male students(P<0.05).However,there was no significant difference between senior and junior school students,only child and non-only child in depression(P>0.05).The male students had lower scores in coping style and social support than female students except for factors of patience and avoidence.The depression symptoms were correlated with factors of coping style and social support except for factors of seeking social support and active rationalization.ConclusionDepression symptom is a common psychlolgical problem in middle school students.Improvements in coping style and social support can promote the mental health of the students.