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According to the features of the time-variant,time-lag, strong burst and the mathematics model that is hard to build in clean water tank. In order to achieve the goal of rapid maintenance the water level at the expected value in the water tank ,and the start and stop of all the water pump at the same time are avoided. A kind of method has been put forward with fuzzy control.By means of MATLAB software,we simulate the control system and verify the rationality of fuzzy control algorithm using in clear water tank water level control,then calculate the output of fuzzy controller and to provide guidance for determining the pump units of the start and stop. S7-200 PLC controller and MCGS configuration software used,we realized the program design of fuzzy control system for the water tank,and given the corresponding fuzzy control PLC program which was applied to the water level control system of the water tank.The result shows that the system has better stability ,fast response which satisfies the control requirements.The fuzzy control theory is combined with the actual control to meet the requirements of the water level control of the water tank, which can extend the service life of the pump, save the electric energy, and provide reference for the automatic control of the water level in the tank.