The CT real time testing on meso-damage propagation mechanism of cracked-sandstone containing one crack under uniaxial compression loading using the CT loading system application in rock and soil media has been accomplished. The CT images

CT number and variance of CT number in different stages such as crack birthing

developing

macro-crack birthing and sample failure are contained. Comparison to the noncracked-rock sample

it shows that the pre-crack can seriously affect the location of new crack birthing and the formation of connectivity macro-crack. Because of the pre-cracked existing

the volume expansion values of the cracked-rock sample under uniaxial compression are large than the noncracked-rock sample.