Objective: To explore the intervention effects of a single unit group counseling on intimate relationships of college students with childhood trauma experiences, and to provide a reference for reducing the negative effects of childhood trauma. Methods: fifty-four college students with high total scores of childhood trauma were screened by the Childhood Trauma Experience Scale as intervention subjects, and a pretest-posttest experimental design was adopted for the experimental control group, and a one-time unit group counseling with the theme of self-esteem was conducted for the experimental group (n=27), while the control group (n=27) did not receive any treatment. Quantitative studies were conducted using the Fear of Intimacy Scale (FICQ), Self-Efficacy Questionnaire (GSES), and qualitative studies using semi-structured interviews to test the intervention effects. Main results: (1) There was a significant difference in the total score of childhood traumatic experiences by gender (t=1.079, p<0.05). (2) For self-efficacy, there was a significant difference between the experimental group on the pre-test and post-test (F=28.508, p<0.05); in the post-test, there was a significant difference between the experimental and control groups (F=5.276, p<0.05). (3) For intimacy fear, there was no significant difference in intimacy fear scores between the experimental control group on the pre and post test, but the main effect on the pre and post test was borderline significant (p=0.066). (4) The qualitative results showed that the subjects could evaluate their childhood traumatic experiences from a more objective perspective after receiving group counseling, and correctly define the relationship between trauma and themselves, while trying to discover their own shining points. Conclusion: This unit group counseling can intervene in the intimate relationship of college students with childhood trauma experience to a certain extent.