Objective To explore the correlation between adult attachment and non-suicidal self-injury （NSSI） in university students. Methods A total of 85 college students with self-injury（ self injured behavior group） and 85 college students without self-injury（ control group） matched by age and sex were selected as the research subjects in a university in Haidian District of Beijing. The Experience in Close Relationship-Revised Version（ ECR-R） and self injurious behavior questionnaire were applied to exam the occurrence and frequency of NSSI. Results The attachment style distribution was securely 27 cases（ 31.8%）， preoccupied 19 case（s 22.4%）， dismissing 26 cases（ 30.6%） and fearful 13 cases（ 15.3%）. The difference of attachment style distribution between self injured behavior group and control group was statistically significant（ P ＜0.05）. There were significant differences in the number of self-injury behaviors among students with different attachment styles （χ2=11.397，P＜ 0.05）. NSSI is associated with insecure attachment. Conclusions Insecure adult attachment styles are the majority in university students with NSSI and it is the related factor of the self-injury behavior.