Clinical observation of external treatment with integrated Traditional Chinese and Western medicine on diabetic peripheral neuropathy

INTERVENTION: 1:Oral administration of mecobalamin;2:Oral mecobalamin + Chinese medicine external treatment; CONDITION: Diabetic peripheral neuropathy PRIMARY OUTCOME: Michigan Neuropathy Screening Scale;Serum superoxide dismutase;Quality of life specific scale for diabetic patients;electromyography;The doctor of traditional Chinese medicine syndrome; INCLUSION CRITERIA: (1) Patients meeting the diagnostic criteria of diabetic peripheral neuropathy and TCM syndrome differentiation criteria; (2) Aged between 18 and 80; (3) HBA1c =10%, or fasting blood glucose =10mmol/L, 2h postprandial blood glucose =16mmol/L; (4) Have enough education and understanding ability, and can easily communicate with researchers; (5) Agree to keep the contract to participate in all clinical interview, examination and test steps required by the program, and sign the informed consent letter.