In the process of strengthening the grinding, in order to to spray the bearing inner channel, the nozzle exit was designed for bending. To minimize the energy loss at bending when grinding material passed, design of the bend radius and bend angle of bending nozzle reasonablely was needed. Pro/E was used to establish 15 kinds of different bend radius and bend angle of computer aided design (CAD) model, and then the ANSYS numerical simulation was introduced to analyze the inner flow field pressure cloud images of these nozzles under the same initial conditions. It is concluded that the energy loss is the smallest when the optimal value is bend angle θ =20°, and bend radius of curvature R =30 mm.