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The expression of an auto-antibody in patients with edematous acute pancreatitis and its possible clinical significance was investiaged. Eighteen cases of acute pancreatitis were chosen as experimental group and 25 subjects served as control group. Venous blood samples were taken in both groups at 4 time points: at the day of admission, the 2nd, 4th and 7th day of hospitalization. By using indirect immuno-fluorescence tests the expression of auto-antibody in the samples was semiquantitatively detected. Other biochemical indexes, such as serum amylase, urine amylase, were determined simultaneously. As well, the clinical signs or symptoms were mitored. It was found that the expression of the auto-antibody was gradually enhanced with the development of acute pancreatitis. The inceased positive expression of auto-antibody showed a correlationship with the improvement of biochemical indexes (r= 0. 951) and clinical manifestations (r= 0. 996). There was significant difference between experimental and control groups (P＜0. 05). During the recovery period of acute pancreatitis, gradually increased auto-antibody expression was detectable. This antibody is against the interstitial structure of the pancreas.