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Abstract The computerized tomography(CT) real-time tests of fatigue damage meso-propagation law of rock under two-grade cyclic loads have been accomplished using specified loading equipment of CT machine. It is shown that in the first grade of cyclic load equal to the strength of 38% to 76%，the standard deviation of CT number under the maximum stress increases with the increase of the number of cycle；while the density and CT number tend to decrease with relatively small variations. The process shows that the accumulation of damage is slow. In the second grade of cycle load equal to the strength of 45% to 90%，although the number of cycle is less than that in the first grade，the changes of standard deviation of CT number under the maximum stress，density and CT number are larger than those in the first grade；in the cycle before failure，the standard deviations of CT number，density and CT number change greatly.
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Received: 26 December 2008
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