The mechanism and method of laser-guided discharge (LGD) to discrete surface processing are studied. In the study of LGD mechanism,it is found that laser guiding controlles the randomicity of processing by common arc discharge in two sides,including a big scale (spacing of discharge areas) and a small scale (inside of discharge area). The position of discharge areas are controlled by the laser focus according to the design. The deepness of discharge areas are increased. The consistency of discharge areas is improved. In the study of surface texturing by LGD,the highness of rim of textured crater and the SRa of textured surface are increased with the augment of peak current. The hardness of rim of textured craters is about 1000 HV. In the study of surface strengthening by LGD,the cross-section shapes of strengthened areas are controlled with the peak current and pulse width. In long pulse-width of discharge,the ratios of diameter to deepness of strengthened areas are similar. The diameters of strengthened areas with high peak current are bigger than those with low peak current. The deepness of strengthened areas with high peak current are deeper than those with low peak current. In short pulse-width of discharge,the deepness of strengthened areas are similar. The ratios of diameter to deepness of strengthened areas with high current are bigger than those with low peak current.