Abstract: In order to investigate the infrared radiation characteristics of the siltstone during the process of temperature，the uniaxial compression tests were carried out on the siltstone samples soaked in water at 50℃ and 100℃.The average infrared temperature(AIRT)，variance，Euclidean distance The infrared radiation temperature field characteristics of the two groups of samples were analyzed quantitatively，and the infrared radiation characteristics of the siltstone under different water temperature were obtained.The results show that the three indexes have the same general trend in the infrared radiation temperature field of water-soaked siltstone specimen at 50℃，100℃，but the development of 100℃ water immersion specimen is far from violent in uniaxial loading failure process Water immersion specimens below 50℃，and the development process tends to be stable and stable development，at the same time to some extent，there is the phenomenon of fissure development lag.