Objective To study the indication,method and value of choledochal exploration through cystic duct.Methods The cystic duct was cut 0.5～1 cm from choledochus and its edge was raised with a forceps and a bakes dilator was inserted to probe the bill duct.If the dilator can not pass the choledochus,palpation around the point of dilator would help to distinguish the stone tumor or narrow.Results In 51 patients with cholecystitis and cholelithiasis,36 were explorated,of which 6 had the explorative indications,4 were postive(66.6%);in 30 without the indications,3 were positive(10%).The total positvity was 19.4%.Conclusions This method is less traumatic,convenient and able to find choledochal disease accurately.The exploration would be done if the cystic duct is over 0.3 cm in diameter.