This paper states the application of a microcontroller (P80C552) that has ADC internally using on the Microwave Remedial Instrument, briefly introduces the composing principle and function of the instrument, and further describes in detail the design of the system's software and hardware. At the same time, the paper describes some components of the Microwave Remedial Instrument, and the basic and the new functions of the microcontroller (P80C552). The intelligent automatic control system makes the instrument more stable and reliable via controlling the Microwave Remedial Instrument intelligently. The testing result shows that this design is realizable.