Objective To implement an intervention on the psychological health of junior middle school students left-behind,to evaluate the effects of intervention,and finally explore the appropriate intervention to improve their psychological health. Methods 1 705 middle school students were selected as the participants through a multi-level sampling method.Mental Health Test (MHT) was used to investigate the psychological health of the participants.group psychological counseling was conducted as an intervention of psychological health for the students.Results 1)There were 546 left-behind students (32.0%) among 1 705 junior middle school students.2)Compared to those not left-behind,the left-behind students had higher score of six simple factors (including learning anxiety,anxiety,loneliness tendencies,physical symptoms,terrorist tendencies and self-blame orientation) and total anxiety tend (P<0.001 to 0.034).3)Results from the repeated measurement data analysis showed that there were interactions between time and treatment factors,eg.,learning anxiety,anxiety,lonely tendency,allergic tendencies and the terrorist tendencies.There were significant differences between two groups on all factors except for physical symptoms. Conclusion Compared to their counterparts,left-behind students had worse psychological health,which can be improved by group counseling.