Aims/hypothesis We investigated the potential effects of the Continuous Glucose Monitoring System (CGMS), as compared with self-monitoring of blood glucose, on glycaemic control in children with type 1 diabetes. Methods The following electronic databases were searched throughout June 2007: MEDLINE, EMBASE and The Cochrane Library. Additional references were obtained from reviewed articles. Only randomised controlled trials were included. Results We included five trials involving 131 type 1 diabetic patients in the study. Combined data from all trials showed that the CGMS did not significantly reduce HbA 1c levels compared with control groups. The pooled weighted mean difference was −0.02% (95% CI −0.29 to 0.25) with a fixed model and remained insignificant in the random effect model. Sensitivity analysis determined that the findings were stable. There was a trend towards a longer time under the CGMS curve for glucose <3.89 mmol/l in the CGMS group compared with the control group (mean difference 49.00 min, 95% CI −18.00 to 116.00). The CGMS significantly increased the number of insulin dose changes per patient per month for those managed with CGMS compared with the control groups (mean difference 6.3 changes, 95% CI 2.88-9.72). Conclusions/interpretation The Continuous Glucose Monitoring System is not better than self-monitoring of blood glucose with regard to improvement of metabolic control among type 1 diabetic children. However, due to the small number of participants and methodological limitations of the studies included, findings of this meta-analysis should be interpreted with caution.