To determine values of UIV, CT-scanner and UIV post scanner in urolithiasis diagnosis, in Duc Giang General Hospital. Subject and method: It was a cross-sectional study on 24 cases with urolithiasis, from 2/3/2020 to 30/09/2020. Results: CT-scanner could detect all urinary stones (100%); UIV, UIV post scanner could detect urinary stones about 50% and 33, 33% repectively. Ability to detect hydronephrosis: of UIV was 75%, of UIV Post scanner was 75% and of CT-scanner was 79,16%. Ability to detect delated ureter of UIV was 50%, UIV Post scanner was 45.83% and CT-scanner was 54,16%. Urinary tract appearance in 7/8 cases used UIV and 22/24 cases used UIV post scanner. Conclusions: CT-scanner was high values in determination of loction, size and number of stone and sign of hydronephrosis and delated ureter. UIV post scanner was high values in determination of shape of urinary tract.