This study will do in 35-75 years old diabetic patient with microalbuminuria. Exclusion criteria: 1) systolic blood pressure > 180mmHg; 2)Diastolic blood pressure > 110mmHg; 3)Serum k > 5.5 mg/dl; 4)CVA or MI in 6 month ago; 5)Treatment whit corticosteroids, NSAIDs, immunosuppressive; 6)Patients whit renovascular disease, obstructive uropathy, collagenous disease, malignancy, alcohol users, addiction; 7)Pregnant or breast fed women; 8)HbA1C > 8%. Sample is 60 persons that will study for 12 weeks. The patients will be divided in 2 groups: First group intake spironolactone 25mg daily plus placebo ½ tablet twice daily; Second group intake spironolactone 25mg daily whit plus losartan 12.5mg twice daily. Blood pressure, Na, K, urea, Cr, will be checked every 4weeks. Microalbuminuria will be measured in the beginning and end of study. We expect microalbuminuria will improve or decrease less than half after 12 weeks treatment.