In order to meet requirement of response speed in temperature measurement occasions

use step response characteristics of resistance capacitance first-order system

design high precision measurement circuit whose measurement time is proportional to the resistance

and put forward a method for fast charging and discharging

eliminate invalid waiting time of measuring method. Based on this idea

respectively use STM32 microcontroller unit（ MCU） I/O open drain and push-pull output control

complete free and fast charging and discharging process

use negative temperature coefficient thermistor（ NTC）

realize high precision temperature measurement. Stability test results show that the measurement system in constant temperature of 25 ℃

continuous measurement of 10 h

relative volatility 0. 006 % NTC thermistor resistance

with higher stability. Temperature response experiments show that the measurement system accords with the typical first-order step response

the response time is shorter than that of the conventional RC temperature measurement circuit

and the response speed is improved. Basically meet the requirements of response speed in general temperature measurement occasion.