Combined with the construction process of successful completion of a directional branch hole ZKS1952 in ZKS1951 hole position of Jiangxi Wushan copper mine, this paper sums up the screw drill deflecting drilling process of directional drilling large angle branch hole in complex formation; mainly introduces the directional drilling principle, equipment selection, drilling technology and the application of screw drill. The target precision and drilling quality fully meet the geological requirements with good geological effects and economic benefits.