On the basis of Similarity Theory, blasting specimen has been built using concrete. Blasting tests have been carried out under the conditions of air and water coupling charges, respectively. Blasting pressure has been measured during the tests and a pressure-duration curve has been obtained. Test results showed that a greater peak pressure has been obtained in the blasting media with water coupling charge. The peak lasted longer, with a low descending speed, and exhibited a peak platform. It was observed that the water coupling charge offers a higher utilization rate of detonation energy,more even distribution of pressure and longer exertion time.With rational blasting parameters, satisfactory results can be obtained for pre-split blasting of water-bearing holes.