Abstract: As one of the key technologies for developing the old oilfield,sidetracking has been widely used in Liaohe Oilfield.Over ten years of field practice,it has developed into a special technology particular for Liaohe.The key technologies are presented,such as its associate techniques,prolonging the life of the sidetracked well,sidetracking horizontal well,sidetracking deep well and the depleted block integrated development by sidetracking,etc.The new sidetracking technologies that will be used for integrated developing Block Jing-17 is also illustrated.