Objective: To observe the value of HbA1c level evaluating the total daily basal insulin dose by continuous subcuta- neous insulin infusion (CSII) in 268 patients with type 2 diabetes mellitus. Methods: 5-point capillary blood glucose was moni- tored in pre- and post-CSII and the insulin dose which could stabilize blood glucose was defined as the total daily dose of insulin, including basal and bolus total dose. Correlation between HbA1c level and total daily dose of insulin in patients with type 2 dia- betes mellitus was analyzed. Correlation between HbA1c level and 5-point capillary blood glucose was also analyzed. Results: Obvious correlation was observed between HbA1c level and the basal total daily dose of insulin if HbA1c was more than 9.3% (r=0.635, P<0.05). The average of 5-point capillary blood glucose was best correlated with HbA1c and fasting blood glucose next best. Conclusion: HbA1c level can forecast basal total daily dose of insulin in CSII. Objective: To observe the value of HbA1c level operated the total daily basal insulin dose by continuous subcuta-neous insulin infusion (CSII) in 268 patients with type 2 diabetes mellitus. Methods: 5-point capillary blood glucose was moni- tored in pre- and post-CSII and the insulin dose which could stabilize blood glucose was defined as the total daily dose of insulin, including basal and bolus total dose. Correlation between HbA1c level and total daily dose of insulin in patients with type 2 diabetes mellitus was Correlation between HbA1c level and 5-point capillary blood glucose was also analyzed. Results: Obvious correlation was observed between HbA1c level and the basal total daily dose of insulin if HbA1c was more than 9.3% (r = 0.635, P <0.05) The average of 5-point capillary blood glucose was best correlated with HbA1c and fasting blood glucose next best. Conclusion: HbA1c level can forecast basal total daily dose of insulin in CSII.