Abstract: Orthogonal test is designed to quantitatively analyze dressing parameters of vitrified CBN wheel on the surface quality of machined part.The results indicate that the feed speed has strong influence on surface roughness and material ratio of the profile and that dressing depth has less influence on roughness but much on material ratio.Wheel is sharper as the reciprocating time is less.The speed difference between roller and grinding wheel influence the surface quality least.In the production practice,larger feed speed,lower dressing depth and more reciprocating times will enhance the surface roughness after dressing,prolong the dressing interval and finally improve the using life of CBN wheel.