The authors reveal advantages of sewing off technics of parietal and visceral peritoneum in gynaecologic operations and Caesarean sections compared with common routine technics of sewing up. This study is prospective, controlled and includes two years period. 170 cases of gynaecologic operations and 45 Caesarean sections are investigated. It is confirmed the role of preoperative microbiologic investigations of cervical secret and vaginal secret. On the base of results similar to world experience in this field authors recommend described technics to gynaecologists and obstetricians.