Abstract: Objective To study the feasibility and effectiveness of group sandplay therapy to improve vocational college students' interpersonal relationship,and to provide a reference for improving their mental health.Methods Subjects of the study were 60 vocational college students,who were futher divided into the experimental group(30) and the control group(30),and group sandplay therapy was performed in the experimental group for 5 times.The interpersonal relationship questionnaire was used to evaluate the interpersonal relationship before and after the experiment.Results The differences among active communication,appropriate refusal,self-disclosure,conflict management,emotional support and total score of both experimental group and control group were of no statistical significance before the experiment(t =-0.965,-1.210,-1.766,-0.051,0.200,-1.185,P>0.05);In control group,active communication,appropriate refusal,self-disclosure,conflict management,emotional support and total score were of no significant difference before the experiment(t=-0.162,-0.507,1.217,-0.168,-0.440,-1.439,P>0.05);In experimental group,interpersonal relationship in active exchanges,self-disclosure,conflict management and total score results were of significant difference before and after the experiment (t =-4.700,-4.275,-3.574,-5.896,P< 0.05);The differences between appropriate refusal and emotional support were of no statistical significance(t =-1.220,-1.438,P>0.05).The group sandplay therapy operation were characterized by coordination and multistage development.Conclusion Group sandplay therapy for vocational college students plays a certain role in improving the interpersonal relationship,so it should be continued in the construction of vocational mental health.