Objective To evaluate characteristics of diagnosis and treatment on severe acute pancreatitis. Methods To respective analysis clinical data of 13 patients with severe acute pancreatitis. The data included baseline characteristics, biochemical tests and imaging data, treatment and prognosis, inclusion criteria for acute pancreatitis with organ failure > 48 h (modified Marshall score > 2). Results Higher heart rate(121.07±28.09) times/min and APACHEII scores(18.92±7.34) were universally found in SAP, which primary disease contained hyperlipidemia (38.5%) > cholelith disease (30.8%) > alcohol (23.1%) with incidence of ARDS and AKI being 46.2% and 69.2%; Higher inflammatory biomarkers including WBC(12.60±5.57)×10⁹/L, CRP(138.16±67.06)mg/L and PCT(15.76±27.33)ng/L indicated widespread inflammation with many infection sites revealing by 69.2% pneumonia and peritoneal effusion on imaging; Other abnormally biochemical index prompted some injury of viscera including heart, lungs, kidney and liver; 1 case suffered death within 7 days and 4 cases also did within 28 days, ICU and total length of hospital stay was (10.77±7.38) and (19.61±13.40) days, CRRT treatment and respiratory support respectively reached 46.2% and 46.2%. Conclusion Severe acute pancreatitis is a acute complex pathological changes on various organs induced by acute systemic and local inflammation with feature of mergence with the ARDS and AKI, which need the multidisciplinary integrated collaborative treatment on organ function protection and sustain and surgical intervention.