Abstract: Abstract:Objective To evaluate the superiority and efficacy of percutaneous nephrolithotomy (PCNL) in the improvement lateral position.　 Methods A total of 67 patients were treated with PCNL in our hospital between July 2009 to February 2011. The patients were placed in the improvement lateral position(with Turning the lithotomy position 60 degrees to the lateral position. The Position of the cathter and then Pneumatic lithotripsy was used for stone fragmentation. The stone debris was removed by irrigation.　 Results Among the 64 cases, 51 were cured with the first operation, the other 13 received catheterization in the firstprocedure. None of the patients were converted to opensurgery. The mean operation time in this series was (132.4±34.1) min. The one stage cure rate in our patientswas 86.6% (58/67). None of the cases had massive blood loss, or injuries to the pleura and otherorgans. Follow-upwas available in 21 cases for1 to all cases have been taken off the water, 63 cases by a single channel, 4 cases by double channel, 11 cases treated by traditional Chinese medicine and ESWL had no residual stones Conclusions There are some advantages in elderly patients, surveillance, security, comfort and improve operation efficiency of the patients in the improvement lateral position.　

Key words: Percutaneous nephrolithotomy, Atmospheric pressure ballistic trajectory gravel treatment, improvement lateral position