The function of cooling tower water distribution system is to sprinkle hot water evenly on the whole packing device. The basic requirements for the water distribution system are as follows: within a certain range of water quantity, the water distribution is uniform, the water resistance is small, the ventilation power is small, ａnd the maintenance is easy. There are three types of water distribution system: pipe type, trough type ａnd pool type. Tubular water distribution system is easy to install ａnd widely used in large ａnd medium cooling towers. The pipe type water distribution system is divided into fixed type ａnd rotary type. The rotary water distributor is composed of water supply pipe, rotary body ａnd water distribution pipe. The water supply pipe is fixed ａnd connected with flange, ａnd connected with rotator through bearing, with sealing ａnd sealing facilities. The rotating body is used to bear all the weight of the water distributor ａnd make the distributor rotate. A number of water distribution pipes are connected at equal distance along the radiation direction around the rotating body. The water flows out through the small holes on the water distribution pipe ａnd pushes the water distribution pipe to rotate in the opposite direction to the water outlet, so as to evenly sprinkle the hot water on the drenching filler