The development direction of metal material laser processing is to achieve small roughness, less heat-affected zone and high depth-diameter ratio. Recently, a kind of water-conducting laser processing technology based on laser water-jet coupling technology has been developed. The basic principle of water-conducting laser processing technology and its advantages over traditional laser processing methods are expounded. Based on the principle of laser water-jet coupling technology, a set of water-conducting laser processing equipment is constructed. The experiments of water-conducting laser processing for various metal materials are carried out. The surfaces of work piece are observed and analyzed by Leica DVM6 digital microscope. The edges of blind holes in two kinds of metal materials are regular and smooth, the edges of grooves are straight and without burrs, and there is no heat-affected zone in both materials. The results of experiments show that water-conducting laser processing tech-nology on metal precision machining is practical and has important application value.