To observe the protective effect of Potentilla discolor aqueous extract for type 2 diabetic rats islet. Type 2 diabetes rat model was induced by fat emulsion formulation and small dose of streptozocin. Biochemical assay was applied to measure serum glucose,total cholesterol( TC),high density lipoprotein( HDL),low density lipoprotein( LDL) and triglycerides( TG). ELISA was applied to measure serum insulin levels. Pancreatic histology was examined by HE staining. Immunohistochemistry( IHC) was employed to exa...