According to the theory of traditional Chinese medicine(TCM),disease treatment should abide by principle,method,prescription,and medicine,so that it can be effective.As a common disease today,diabetes has a variety of complications,which affects the quality of life,determines the prognosis,and causes death or disability.TCM has obvious advantages in the treatment of diabetes.The classical prescriptions follow the principle and method,which can achieve good effect with low dosage.The current prescriptions keep pace with the times and are innovated on the basis of principle.