Firstly, the fluff length on the cloth of the billiard table should not be too long. Too long fluff will greatly increase its frictional resistance, and may even lead to tangled and unsmooth knotting, which seriously affects the speed and accuracy of the rolling of the hit ball. In addition, under the premise that the density of the cloth does not change, it is not suitable to choose products that are too thick, because this will also increase the frictional resistance. Of course, in addition to the problem of the cloth, the temperature and humidity in the room will also affect the speed of the ball to a certain extent, but compared to that, it is indirect and negligible. These external environmental factors will also act on the cloth first and then affect the movement of the billiard ball. If the selection of the cloth is improper, this influence will be increased.