Under observation there were 128 patients with neclostridial peritonitis (NP) which made up 19.3% of the total number of patients with peritonitis. In spreaded NP when the source of NP was successfully eliminated and fibrinous layers on the peritoneum the laparotomy wound was tightly sutured up to the aponeurosis (included), primary delayed sutures were put on the skin. When it was impossible to completely remove all the fibrin from the peritoneum, the wound was sutured through all the layers, the sutures were tied in bows followed by numerous revisions of the abdominal cavity. Laparotomy was performed in postoperative NP with phlegmons of the abdominal cavity. The use of the tactics described allowed lethality to be reduced from 39.4% to 13.7%.