Abstract: The directional drilling technology described here can minimize the frequency of adjusting orientation and changing BHA,thus can cut down the costs of drilling directional wells effectively.This paper focuses on its configuration design,determination of the initial orientation,well trajectory control and safety drilling technologies,etc.This technology has been used in 30 directional wells in Jiangsu Oilfield,with good results achieved,e.g.,95% of the wells were free of orientation adjustment,the frequency of changing BHA for trajectory control was dramatically cut down,and the drilling period was also shortened in certain degree.