Abstract: To reveal the formation mechanism of outlet burr during the grinding process of nickel-based superalloy, a two-dimensional finite element model of high-speed grinding of Inconel718 alloy with a single PCBN particle was established, and the feasibility of the model was verified. DEFORM-2D was used to study the outlet burr formation process, which was divided into eight periods. And the effects of grinding speed, grinding depth, abrasive particle cone angle and edge radius on the burr were analyzed by orthogonal experiment. The results show that the size of outlet burr is mainly composed of burr width and height, which are sensitive to the grinding depth. The greater the grinding depth, the greater the burr width and height. In addition, with the increase of grinding speed, abrasive particle cone angle and edge radius, the burr width also increases, but the burr height is insensitive to these three parameters.