 This study is a randomized, double-blinded, placebo-controlled clinical trial on type 2 diabetic Kidney Disease in early stage microalbuminuria excretion rate 20-200mgmin to evaluate the therapeutic effect of tang shen prescription. 632 participants will be recruited for the study, all of whom had type 2 diabetes, serum creatinine concentrations is normal, and no evidence of non-diabetic renal diseases. The subjects will be randomized to treatment with either tang shen prescription or placebo. 