Abstract：The CT testing study on meso-damage propagation characteristics of frozen cracked-sandstone with double man-made cracks under uniaxial loading using the CT special testing system is accomplished. The CT images and CT number in different stages，including micro-crack birthing，development，marco-crack birthing，and sample failure，are obtained. It shows that，compared with the frozen intact rock sample，the man-made crack can seriously affect the location of new crack generation and the formation of connectivity macro-crack of frozen cracked-rock sample. Because of the man-made cracks existing，the volume expansion values of the frozen cracked-rock sample under uniaxial compression are large than those of the frozen intact rock sample.
