This paper introduces the single-chip microcomputer 51 of the cooking process as the core platform for the design of temperature control. And describes its hardware and software design methods and gives the system schematic diagram of the hardware, software flow chart. In the design of the furnace temperature measurement using thermocouples, and its multi-channel signal into the amplifier switches CD4051, as amplified by the A / D circuitry to convert the volume of the corresponding figure, and then through the optocoupler isolation, into the host circuit . By the host for data processing, analysis to determine the deviation in accordance with the laws of fuzzy PID control operation after the output figures for the volume. Small deviations in the use of the improved PID algorithm, the use of large deviations in the fuzzy control algorithm for numerical signal photoelectric isolation,，by the D / A converted into analog circuit, and then through the V / I conversion to be 0 ~ 10mA DC current. The current into the thyristor voltage regulator (ZK-0), triggered thyristor, adjusted for the temperature to rise by a predetermined, lower curve changes in the law. Finally，I achieved the temperature control.
