Abstract: Objective To explore the relationship between suicide ideation and family environment for suicide prevention.Methods Totally 10 152 university students were investigated with University Personality Invertory(UPI) and Family Environment Scale-Chinese Version(FES-CV).Results The incidence rate of suicide ideation was 2.59% in the students.The scores of suicide ideation group were lower than those of the control group in cohesion(6.60?2.138 vs 7.09?1.938),emotional expression(5.20?1.782 vs 5.55?1.658),success(5.45?1.507 vs 5.73?1.435),and sense of organization(5.11?1.596 vs 5.51?1.769),but higher in contradictory(3.40?1.846 vs 3.06?2.049),knowledge(4.05?1.707 vs 3.59?1.901),and control(3.81?1.614 vs 3.49?1.966).There were significantly inverse correlations between suicide ideation and cohesion,emotional expression,success,and sense of organization(r=-0.120,-0.101,-0.093,and -0.115),but positive correlations between suicide ideation and contradictory,knowledge,and control(r=0.085,0.123,and 0.088).Step regression analyses showed that knowledge,sense of organization,and emotional expression could explain 4.0% of the total variation.Conclusion The family environment is an important influence factor of suicide ideation among university students.