本文对大功率连续波一氧化碳激光器工作气体的温度测量问题进行了详细的研究。采用高精度恒流源偏置下的铂电阻作为探测传感器。实验证明，铂电阻测量具有良好的线性及较强的抗电磁干扰的能力。分析表明，其测量误差可以限制在１％以内。温度的显示选用ＭＣ１４４９９驱动４位ＬＥＤ数码管来实现，这种方式有力地配合了ＤＯＳ内存驻留软件的设计。 This article has carried on the detailed research to the temperature measurement problem of the working gas of the high power continuous wave carbon monoxide laser. High-precision constant current source bias platinum resistance as a detection sensor. Experiments show that platinum resistance measurement has good linearity and strong anti-electromagnetic interference ability. Analysis shows that the measurement error can be limited to less than 1%. Temperature display using MC14499 drive 4 LED digital tube to achieve, this approach effectively with the DOS memory-resident software design.