【Objective】 To investigate the value of MRCP in evaluating the preoperative feasibility of laparoscopic trans-cystic common bill duct exploration. 【Methods】 A total of 78 patients with choledocholithiasis were divided into two groups (the LTCBDE group and LCBDE group) according to MRCP. The value of MRCP to the LTCBDE was evaluated. 【Results】 All patients were evaluated and divided by using MRCP preoperatively: 30 patients were in LTCBDE group and 48 patients in LCBDE group. 27 patients in LTCBDE group(27/30) accepted LTCBDE, other 3 cases received the LCBDE. 43 patients In LCBDE group (43/48) accepted LCBDE, other 5 cases received the LTCBDE. 【Conclusion】 MRCP is not only a useful tool to evaluate the preoperative feasibility of LTCBDE, but also has a significant guiding role for the operation.