In this paper we introduce the PDCA theory into the computer communication, realize the computer cyclic block control, and get the overall arrangement network of computer sensor. In the first part we introduce the application of PDCA in computer, the second part we establish of the mathematical model of computer block cyclic control theory. In order to verify the availability of mathematical model, we designed the computer control experiment of digital sensor. After the temperature calibration of DHT11 sensor in temperature check box, the calibration data is stored in the OTP memory in the form of a program. And we use Keilu Vision2 compiler to realize the LED display of detected temperature. It provides the technical reference for the application of computer control technology.