Abstract：The stress field and acoustic emission(AE) field of two kinds of discontinuous jointed faults，en-echelon faults and collinear disconnected faults，are numerically simulated using rock failure process analysis code (RFPA2D). The thermal infrared radiation(TIR) from the loaded rock surface of modeled jointed faults is detected by a TIR imager，and the experimental boundary conditions are similar to that of numerical simulation. The detected TIR is analyzed and compared with the numerical test results of AE. It shows that the spatio-temporal characteristics of TIR radiation and AE are similar. Besides，by comparing the TIR images with the stress field and visible light photos，it is revealed that the TIR from different cracks，such as the wing crack and shear crack，present different characteristics. The physico-mechanical mechanism of the TIR abnormal and difference are discussed.
