A Study of Xuebi Formula for Diabetic Peripheral Neuropathy(Qi-deficiency and Blood-stasis)

* according to the 1999 WHO criteria, in accordance with the diagnostic criteria for type 2 diabetes. * according to the diagnostic standard of diabetes peripheral nerve lesions. * age range 30-70 years. * Syndrome of traditional Chinese medicine is Qi deficiency and blood stasis. * FBG \< 13.9mmol/L, HbA1c\<10%. * signed the informed consent Exclusion Criteria: * did not meet the inclusion criteria, or incomplete information affect the clinical syndrome differentiation type; * repeated hypoglycemia reaction, nearly a month diabetic ketoacidosis, DKAand severe infections; * blood pressure without control or after control, SBP ≥ 160mmHg or (and)DBP ≥ 100mmHg; * TG≥ 5.6mmol / L; * diabetic lower extremity vascular disease (resting ankle brachial index in patients with ABI ≤ 0.90 or lower extremity ultrasound vascular stenosis \> 50%). * pregnancy, to pregnant or lactating women; * the ingredients allergy of Chinese herbal medicine and allergic constitution person; * psychiatric patients; * have serious heart, lung, liver, kidney, brain and other complications overassociated with other severe primary diseases; * other patients had participated in clinical trials or are in other clinical trials before the test in January; * in the past 5 years with alcohol and / or psychoactive substances, drug abuse and dependence; * according to the researcher's judgment, can reduce the possibility of the group or other diseases or conditions were complicated, such as work environment change frequently, the living environment is not stable, easy to cause lost * hepatic, renal impairment (ALT, AST is greater than 2.5 times the upper limit of normal value; serum creatinine greater than 1.5 times the upper limit of normal value); * demyelinating lesions or from other causes of polyneuropathy patients.