Magnetic abrasive finishing is an important method in machining the ZrO2 material．The general open rectangular slot of the magnetic are still low in grinding efficiency, the processing effect is not ideal due to the high strength and hardening of ceramic materials. Therefore, in the design of magnetic pole, N45 permanent magnet material was used to machining ring groove, from the bottom up to a certain depth of the magnetic pole. And the magnetic field intensity distribution of the pole in ring groove and rectangular slot was simulated used in ANSYS simulation software. It is found that the magnetic field distribution of the ring pole is more concentrated, and the magnetic field distribution is stronger when the pole is taper. The experiment results show that the ring groove can improve the gradient distribution of the magnetic field and enhance the abrasive pressure so that the surface roughness of ZrO2 material is decreased from 1.7 μm to 0.45 μm in 20 minutes. The machining efficiency is obviously improved and the surface quality is significant improved.