Objective: To investigate the effect of interaction between TPH-2 gene rs17110747 polymorphism and negative life events on depression in college students. Methods: 315 college students were measured by the adolescent life event scale and the flow center depression scale, and the blood was extracted by the professional nurses and then the DNA classification was carried out. Results:The main effect of rs17110747 polymorphism and life events on College Students’ depression was significant, and there was a significant interaction between the two. ...