The symptom of AP in biliary tract stones: 73.3% had pain on right upper quadrant, 19.4% had fever, 7.17% had shock, jaundice occurred in 53.3%, and 81.8% had elevated amylasemia (over 250 UI / l). 17.6% had haemorrhage, necrosis and abscess, severe morbidity and mortality occurred in 8.5%.