Abstract: Miao C25-15 is a sidetracking well completed by Great Wall Drilling Company in Jidong oilfield.During well opera tion,some comprehensive matching techniques,with the in tellectual property of their own,such as sidetracking window cutting,reaming and well completion have been put into ap plication,solving general existing problems of sidetracking in Laoyemiao area,such as small annular clearance,thin ce ment annulus,poor cementing quality and liners difficult to be placed in the middle,successfully completing the side tracking in C25-15 and providing a practical basis for side tracking popularization in Jidong oilfield.