This article to research through SHPB test of the rocks in the plastic damage under the cumulative effects. This paper selects bullets for the diameter steel rods, the bullet hit by a fixed speed when fixed, selects the two kinds of circumstances for gas chamber pressure such as P = 0.6 MPa and P = 0.7 MPa. It is concluded that the main important conclusions: Test specimen didn't reach the effect for ,Limestone which is no initial damage to absorb lesser energy, as the same time the internal stones damage were also lower, and with the impact times accumulation, limestone damages degree were increasing, eventually make the specimen destroy. The internal of rock specimens are low destroy, when has the same effect, specimens receiving the maximum stress by lesser,when the internal damage can cumulative increases to certain value, and is suffered the same stress effect, finally the maximum stress will be decreased. For rocks material at repeated impact as low speed , under this action show the obvious plastic damage accumulation effect.
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