Abstract: Objective To explore effects of family environment and coping style on suicide idea in college students.Methods With randomized sampling,585 students were investigated with a self-designed questionnaire on suicide idea and self-injury behavior(SIB),Self-Rating Depression Scale(SDS),Family Environment Scale-Chinese Version(FES-CV),and Simplified Coping Style Questionnaire(SCSQ).The data were analyzed with t-test,χ²-test,correlation and regression analyses.Results Of the students,20.9% had suicide idea and 11.6% had suicidal behaviors.The rates of suicide behavior and SIB in females and the students with suicide idea were significantly higher than those of the controls(P<0.001).The results exhibited that female(odds ratioOR=2.391),negative coping style(OR=2.796),depression(OR=1.071),SIB(OR=4.003),and with at least one suicidal action(OR=5.492)were risk factors of suicide idea,while cohesion in family(OR=0.879)may be a protective factor.Conclusion Suicide idea in college students is significantly influenced by gender,depression,family environment,negative coping style,and the experiences of suicidal behavior and self-injury behavior.