In order to meet the requirements of fast stability and accurate control of temperature in spectral micro detection room

an air bath temperature control system for sample detection room with fast heating of heating rod and Peltier constant temperature is designed. The system takes the microcontroller unit as the core

and integrates the fuzzy proportional integral differential（ PID） control algorithm

realize the complementary function of fast heating and precise constant temperature. The experiment compares the previous system of single temperature control

constant temperature control of water bath Peltier

and the test result shows that the temperature can be accurately controlled within（ 40 ± 0. 3） ℃ in 5 min. It decreases much time of temperature control

and it has good repeatability and high accuracy of temperature control. So

it can meet the requirement of temperature control of the spectral micro-testing room.