A device for removing burr is designed according to the burr problem existing in the intersection of a rotating body part. In order to verify the feasibility of process and to find the optimal process parameters, FLUENT software was used to study the flow field under the condition. The velocity variation of the flow field, the particle trajectory and the effect of different process combinations on the removal efficiency were investigated by using Discrete Phase Model (DPM) and dynamic mesh technique. The results show that the design of the fixture has played a stirring function, making the fluid with a higher axial and radial velocity to impact the edges, corners and arris of the rotating body; the particle movement is random, each cycle the trajectory of particle motion was not the same, disorder of its movement ensured the surface not to produce directional scratches; erosion of the main parts occurred in the burrs, the feasibility of the process is verified. When the rotational speed was 4 000 r/min and the reciprocating linear motion was 0.05 m/s, the removal efficiency is quite suitable.