Clinical Trials for the Optimal Dosage of Tang Ning Tongluo Capsule

Inclusion Criteria: 1. Fulfilled diagnostic criteria for type II diabetes and TCM syndrome diagnostic criteria. 2. Age between 18-70 years. 3. The blood sugar meet the following criteria: fasting blood glucose ≥ 7.0mmol/L, ≤ 13 mmol/L and (or) ≥ 2 hour postprandial blood glucose 11.1 mmol/L, ≤ 16 mmol/L; eligible conditions in blood glucose, glycosylated hemoglobin to ≤ 10%. 4. Traditional Chinese medicine symptom score ≥ 4 points. 5. Participated in the experiment voluntarily, and signed the informed consent form. Exclusion Criteria: 1. Durring the cleaning period, blood sugar dropped to below detection diagnosis value through diet, increasing activity. 2. Secondary diabetes mellitus or nearly a month using insulin; or is the use of insulin sensitizers (thiazolidine two ketones), repaglinide, Bernard Glenn Nai, alpha glucoside enzyme inhibitor (acarbose, voglibose), other traditional Chinese medicine. 3. Within the past 1 months, with diabetic ketoacidosis and other acute metabolic disorders. 4. ALT is 2 times higher than the upper limit of the normal value, Cr is higher than the upper limit of normal persons. 5. Has severe heart, liver, renal, hematopoietic system disease, or other serious diseases and mental disease patients. 6. Pregnant, lactating women and prepare for pregnancy. 7. The allergic constitution and the drug allergy known composition. 8. For nearly a month with severe infection or other emergency state, such as trauma, operation etc.. 9. within the past 3 months, participated in the other drugs.