Aim. To examine blood flow in renal and intrarenal arteries and its changes in the acute pharmacological test with captopril in patients with chronic glomerulonephritis (CGN). Material and methods. Renal circulation was studied in 50 patients with CGN using ultrasound dopplerography (USDG) of renal vessels on the unit GE Logiq 400 CL PRO Series. The velocity and indices of peripheral blood resistance in the major renal artery (RA) and in intrarenal arteries were estimated. In 26 patients the blood flow was studied again after intake of 50 mg captopril. Results. Poor renal blood flow was registered in cortical parenchyma in 36% CGN patients (with chronic renal failure in 75%). Multifactorial regression analysis has demonstrated that only blood creatinine was independently related with slowing down of the blood flow at the level of RA and intrarenal arteries. Morphological index of activity correlated with resistance indices while a high sclerosis index correlated with blood flow slowing. Older patients had higher resistance indices. Captopril significantly accelerated Mod flow and insignificantly changed indices of peripheral resistance including those in CRF patients. Conclusion. Poor blood flow in the cortical layer of renal parenchyma in CGN, according to USDG, occurs rather frequently and was associated with CRF and older age of the patients. Blocking of reninangiotensin system at the level of angiotensin II formation improves renal blood flow in most of the patients.