Abstract: Industrial production at  certain temperature conditions will proceed in accordance with the predetermined direction,so temperature control is to ensure normal production process.The author introduces a high-precision temperature measurement and control system based on Pt100 platinum Resistance.Pt100 platinum resistance is used as temperature sensor in the system,median value average filtering is used to eliminate the sampling value of the deviation,successive approximation method to eliminate the non-linear of temperature control system,and PID algorithm to control executing agency through the implementation of PWM.Thus,in -200 ~ 601  ℃,0.1  measurement resolution and ± 0.5 ℃ control precision are ensured.

Key words: PT100；medium value of the average filter；successive approximation method, PWM