Object：To evaluated the surgical skill and safy of laparoscopic heminephrectomy in patients with duplex kidneys. Methods: From 2015 to 2018, five unilateral laparoscopic heminephrectomy were performed by single surgeon in our center. All patients were diagnosed as duplex kidney by enhanced CTU.Patients' characteristics, surgical skills, operative time, and blood loss, intestinal recovery time, length of hospital stay were all collected retrospectively. Results: All five patients were successful completed. Mean operative time was 152±32.7min（110-200min），intestinal recovery time was 2±1.1 days（1-3 day）. Mean hospital stay was 7±1.1day（5-8 days）. On mean follow-up of 6-32 months, B ultrasonography and renal function indicated that the residual kidney was normal. Conclusion: The technique of laparoscopic heminephrectomy with duplex kidneys is safe and reliable. Seperation of renal hilum vessels is the key to protect the renal function. The key to prevent the recurrence of urinary cysts is complete removal of pelvic mucosa.