2型糖尿病患者因常有超重和胰岛素抵抗现象而须大量胰岛素控制血糖 ,但胰岛素治疗又可增重而须加大胰岛素用量 ,作者评价 2型糖尿病患者在单用胰岛素未能控制的情况下 ,联用二甲双胍的血糖控制效果和外源性胰岛素的需要量。方法　入选标准 :30岁后诊断为 2型糖尿病的患者 ,至少 Patients with type 2 diabetes due to overweight and insulin resistance often require a large number of insulin blood sugar control, but insulin therapy can increase the weight and need to increase insulin dosage, the authors evaluate type 2 diabetes in patients with insulin alone failed to control the case, The combination of metformin’s glycemic control and exogenous insulin requirements. Methods Inclusion criteria: Patients diagnosed with type 2 diabetes after age 30, at least