Objective To exploring the impact of impulsive personality traits on suicide risk in adolescents with depression and the chain mediating role of rumination and sense of security.Methods A total of 211 adolescents with depression were invited to complete the Ruminative Responses Scale, the Security Questionnaire, the Barratt Impulsiveness Scale and the Beck Scale for Suicide Ideation.Structural equation modeling was used to test hypothesized relationships among variables.Results The sample scored (24.65±3.27) for suicide risk, (107.65±14.16) for impulsive personality traits, (57.28±7.14) for ruminative thinking, and (40.26±6.22) for sense of security.The total indirect effect of ruminative thinking and sense of security on the relationship between impulsive personality traits and suicide risk was 44.33%, of which 20.10% was mediated by ruminative thinking, 17.53% by sense of security, and 6.70% by the chain effect.Conclusion Impulsive personality traits not only directly but also indirectly, via ruminative thinking and sense of security, affects suicide risk in adolescents with depression.The impact of impulsive personality traits on suicide risk can be attenuated by modulating rumination and enhancing sense of security.