Objective The evaluation of high-intensity intermittent training （HIIT） on body composition by Meta-analysis provides a theoretical basis for subsequent HIIT in improving body composition of junior high school students.Method Web of Science， PubMed， EBSCO and China national knowledge internet （CNKI） were used to collect RCTs on body composition of junior high school students， the risk quality of these research documents were evaluated by Cochrane risk， and heterogeneity test， sensitivity analysis and publication bias analysis were conducted with the help of Review Manage 5.4.1 and Stata 14.0 software.Result A total of 16 RCTs were included. Meta-analysis showed that HIIT could significantly reduce the weight of junior high school students （MD = -1.18， 95%CI ： -1.39 ~ -0.98， P<0.01）； improve body mass index （BMI）（MD = -0.65， 95%CI ： -0.79 ~ -0.51， P <0.01； reduce body fat rate （MD = -0.46， 95%CI = -0.59 ~ -0.34， P<0.01）， waist circumference （MD= -1.08， 95%CI ： -1.24 ~ -0.92， P<0.01）. In terms of weight， boys improved more effectively than girls； in terms of BMI and waist circumference， there was little difference between boys and girls； in terms of body fat rate， girls improved more effectively than boys.Conclusion High-intensity interval training has a good effect on improving the body composition of junior high school students， which can significantly reduce their body weight， improve their BMI， and reduce their waist circumference and body fat rate.