Objective To explore the effect of psychological intervention on improving the mental health level of the prisoners' minor children,and provide a theoretical basis for the school mental health education. Methods The 31 prisoners' minor children were asked to fill out a questionnaire survey by Mental Health Test(MHT).The research objects were divided into experiment group and reference group,and the experimental group was given an eight-week psychological interventions.Results 1)Among the prisoners' minor children,the detection rate of psychological problem was 38.7%,the sequence of the detection rate was learning anxiety(67.7%),physical symptoms(45.2%),self-accusation tendency(41.9%),allergic tendency(22.6%),terror tendency (16.1%),the anxiety on human(6.5%),impulsive tendency(6.5%).2)There was significant difference between the experimental group and the reference group before and after intervention(t=6.727,P<0.001). 【Conclusions】 The level of mental health of the prisoners' minor children is poor,and the outstanding problems are learning anxiety,physical symptoms and self-accusation tendency.The psychological intervention can significantly improve the mental health level of the prisoners' minor children.