Objective To investigate the relationship between glycosylated hemoglobin A1c （HbA1c） and blood glucose levels of eight different points throughout the day in well-glycemic-controlled medical nutrition therapy （MNT） alone type 2 diabetic patients. Methods Data were collected as capillary blood glucose value of eight different sample points among sixteen observing days in thirty MNT alone type 2 diabetic patients. The correlation between HbA1c and capillary blood glucose value was evaluated by Pearson’s correlation method. Results The r-values between HbA1c and capillary blood glucose of 3:00

6:00

and bedtime （22:00-23:00） were 0.81

0.79

and 0.78

respectively（P<0.001）. The best correlation was found between the mean value of 8-point blood glucose value throughout the day and HbA1c （r=0.84

P<0.001）. Conclusion Fasting blood glucose and postabsorptive blood glucose have better correlations with HbA1c compared with other points in this group of well-glycemic-controlled MNT alone type 2 diabetic patients.