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According to axial fan used in industry, the intelligentized controller based on DSP2808 is designed. The DSP system, the CPLD system, the drive circuit, the power circuit, the fault detect and protect circuit, the flyback converter are presented. The method of flux regulation for the fan is analyzed. According to the temperature feedback, the controller has wide range of speed regulation by adopting PWM technique for energy saving. The controller is able to receive the speed reference by potentiometer, temperature sensor and 485 bus, the three methods are voted by DSP. The controller also has the function of motor windings over temperature, IGBT over temperature, AC over and under voltage, DC over and under voltage, DC over current detecting and protecting. The experiment results show that the uniform acceleration soft starting, the transition between starting and speed closed loop are achieved, the noise of the fan is reduced effectively and the energy saving is also realized.