 This research aimed to develop a new classification system for peritonitis, based on the existing classification, schemes and the experience of treating 188 patients at the Duchamp Bay City Emergency Medical Center. The authors compared their proposed classification with the classification of K.S. Simonian and found that the former was more applicable to the majority of cases due to the presence of a toxic phase of peritonitis, which is more common than the reactive stage. Additionally, the terminal stage of peritonitis is often untreatable due to its extreme nature, making the Simonian classification less useful in practice. The author's classification provides a more accurate representation of the severity of peritonitis and can be used to guide the selection of appropriate surgery or intensive care treatments.