Different diameters’ table tennis bring out paddler different experience qualities, meanwhile it gives audience different ornamental quality. Take paddler universal serve strength 40N as striking force, according to information, it works out that best visual table tennis shifting effect is 13.09 m/s and table tennis best radius is 42mm.Then consider from paddler hitting percentage, table tennis collides the table, the bigger original route deviation angle is, the more difficult paddle receive would be, so that fewer times of back and forth would be. Based on this theory, with the same strength, calculate diameter 40mm table tennis collides table deviation angle is 16.1°, diameter 38mm table tennis collides table deviation angle is 32.1°, so that define 40mm table tennis has an advantage over 38mm table tennis. Finally by Monte Carlo simulation experiment defines that best table tennis radius is 42mm.