By deduction from explosion mechanical equations of detonation wave interaction at interface,the simplified calculation method of blast vibration acceleration of target head face was put forward in solid medium after charge explosion. Blast experiments in concrete were performed,and the simplified calculation method was verified by the experimental results. The vibration acceleration value measured by the experiment was 1.47×10⁵ m·s^-2,and it was close with the result calculated by the simplified calculation method(1.73×10⁵ m·s^-2). Results show that the accuracy of the simplified calculation method could meet the needs of engineering design,and the a-t curve of the solid medium after blast could be calculated anywhere if the exact detonation wave p-t curve is known.