Objective: To observe the effect of Jiangtangsanhuang( JTSH) on growth factor-β1( TGF-β1),Smad1,Co1-Ⅳ of early diabetic nephropathy rats,and investigate its protective effect for kidney. Methods: Eighty SD rats were randomly divided into normal control group( n = 11) and diabetic model group( n = 69). The diabetic models were induced by lower-dosage of streptozocin( STZ)( 30 mg /kg). The model group was then divided into three sub-groups including early DN group,Irbesartan group( 0. 027 g·kg- 1·d- 1) and J...