Objective To explore the effect of internet-based health management as a form of glucose control measure for patients with type 2 diabetes mellitus. Methods A cluster randomised controlled trial was conducted to recruit patients from two hospital affiliates, with 104 cases from each affiliates being either assigned into the control group, or the intervention group. The former received routine diabetes management, while the latter was subjected to internet-based health management. Metabolic indexes (fas-ting blood glucose, 2-hour postprandial blood glucose, glycosylated hemoglobin, triglycerides, serum total cholesterol, body mass index) and self-management were measured and compared between the two groups at baseline, and 12 months of intervention. Results After the intervention, the intervention group had better metabolic indexes, and higher scores of foot care, diet control, regular exercises, and glucose monitoring, than the controls （P＜0.01 for all）. Conclusion Internet-based health ma-nagement can improve the metabolic indexes and self-management ability of patients with type 2 diabetes.