The goal of research is learning the change dynamic of "mature" fibrin in ridneys parenchyma in treatment of experimental bilious peritonitis with sodium hypochlorite. The work was made on 31 mongrel dogs, which were divided into two groups: control and experimental. It was revealed on with 24-hours experimental bilious peritonitis the presence of hyaline cylinders in the lumen of glomerular capillaries, which give a positive reaction to the "mature" fibrin. On the 3rd day of treatment with sodium hypochlorite in kidneys was revealed "mature" fibrin mostly extravascular localization with the significant decrease both the average size of "mature" fibrin and its volume fraction, which completely disappeared. what was the evidence of the arresting of hemocoagulation disorders under the influence of sodium hypochlorite.