Hydraulic fan, as the name suggests, it is to use water other than traditional electricity to drive the fan. In hydraulic fan cooling tower, hydraulic turbine is used to replace motor as the power source for fan. Driving force for running hydraulic turbine comes from surplus energy of the system. After the reconstruction, circulating water provided by water pump flows through the hydraulic turbine and drives it to rotate. Output shaft of hydraulic turbine is connected with fans directly to drive the fan rotate.