Abstract: Dressing of grinding wheel has especially significant effect on grinding behavior when grinding titanium alloys because of serious adherence between abrasives and workpiece material. Experiments of rotary diamond dressing of SG wheels for titanium alloys grinding were conducted to investigate the effects of different dressing parameters on the grinding operation. The grinding force, surface roughness and topography of ground surface were measured by varying dressing parameters, including axial speed, dressing depth of cut and speed ratio. Experiment results show that the grinding forces increase with decreasing of axial speed or dressing depth of cut and a better surface finish could be obtained simultaneously. The effect trend on surface roughness of dressing ratio is complex. It was found that the workpiece can obtain better surface quality ground by the wheels trued at speed ratio 0.4. Finally, the dressing mechanism of diamond roller and surface forming mechanism was discussed on the base of systematical analysis of effect on grinding operation of different dressing parameters. The results provide an experimental basis for diamond roller dressing of SG wheels in the grinding of titanium alloys.