| The development of control system of wastewater disposal at home and abroad was introduced, and the practicability of fuzzy control system was demonstrated. Aiming at the characteristic that dissolved oxygen changes irregularly in wastewater disposal. A suit of fuzzy control system whose control parameter is dissolved oxygen was designed.The control system consists of fuzzy controller, blast and aeration system, frequency control equipment and DO tester. The integration element was introduced into the designed fuzzy controller, and its primary part is the singlechip of Type AT89C51. The fuzzy control table that is of great importance in control was calculated off line with software MATLAB. The anticipative results were obtained via the design and simulation of the controller. In addition, the quantifying genes that influence its performance were analyzed theoretically.The dissolved oxygen fuzzy control system provides an available way for the automatic control for DO in wastewater treatment. It not only can resolve the problem that it is difficult to establish the mathematic model of the dissolved oxygen concentration, but also can overcome the drawback that the general planar controller can't eliminate the static receiver error, but only has good dynamic characteristic.
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