A total of 1,176 college students were administered the Positive Attention Awareness Scale, the Suicidal Behavior Screening Questionnaire, the Rumination Scale, and the Psychological Distress Scale to analyze the chain mediation mechanism of trait mindfulness on suicidal ideation by structural equation modelling. The results showed that trait mindfulness and suicidal ideation had a significant negative correlation among college students. In addition, there is a chain mediation of rumination and distress between trait mindfulness and suicidal ideation. Trait mindfulness could reduce rumination and further reduce distress, and ultimately reduce suicidal ideation. The results suggest that mindfulnessbased training (e.g., Mindfulness Based Stress Reduction and Mindfulness Based Cognitive Therapy) are suitable and effective for the intervention of suicidal ideation in college students.