2785 patients with hepatic hydatid cyst were treated operatively since 1965 to 1995, and the hydatid cyst rupturing into choledachus occurred in 37 patients (1.3%). Clinical manifestations, diagnosis and operation were described. In epidemic area the possibility of hepatic hydatic cyst rupturing into choledochus should be considered when the patient suffers from stiffness of abdominal muscles, Jaundice, right epigastric pain, hepatic mass and positive reaction of Casoni test. Ultrasound and CT are major means for the diagnosis of this disease. Early operation is the treatment of choice.