Objective To evaluate the clinical efficacy of polyethylene glycols (PEG) on functional constipation in children by Meta-analysis.Methods The Medline,Pubmed,Cochrane database,Embase,VIP database,China Knowledge Resource Integrated Database (CNKI) and WANFANG MED ONLINE resources were reviewed for the treatment with polyethylene glycols on functional constipation in children from the inception to December 2016 to collect all randomized controlled trials (RCTs) or comparative prospective studies.Revman 5.3 software was used to assess risk of bias of the Cochrane Collaboration's tool.A Meta analysis of the therapeutic effect of polyethylene glycols on functional constipation in children was conducted by Stata1 1.0 software.The pooled standardized mean difference (SMD) and 95％ confidence interval (95％ C/) were calculated in order to know the clinical efficacy of polyethylene glycols on functional constipation in children.Results Seven literatures were included in our Meta analysis.There were 662 children were included in this study,and they were divided into PEG treatment group (n=318) and non-PEG treatment group (n=344).The forest plot results of Meta analysis showed that the main effect index weekly stool frequency was significantly higher in PEG treatment group than that of lactulose group,according to the different control measures.The main effect index weekly stool frequency was significantly higher in PEG treatment group than that of non-PEG treatment group,according to the mapping forest chart displayed different clinical effect observation time points.Results from Meta analysis showed that the secondary effect index successful stool consistency improvement was significantly higher in PEG treatment group than that of non-PEG treatment group,according to different observation time points.Conclusion Polyethylene glycols is safe and effective in the treatment of functional constipation in children.