Abstract: The air ratio and decoupling coefficient has a great influence on the effect in pre-splitting blasting.Reasonable parameters can control the scope of failure effectively.For the dynamic property of rock under blasting load generated by air-decked decouple charge during the pre-splitting blasting，the paper research the attenuation law of the shock wave and velocity under the condition of continuous charge structure using finite element dynamic soft Autodyn.Through change air ratio of the charge，it analyses peak value of shock wave distribution along the wall of hole.It also research the shock wave pressure and stress propagation under the influence of decoupling coefficient when discontinuous charging.The results show that in continuous charge conditions，the peak value of shock wave of the area near the blasting hole is more than the dynamic compressive strength of rock.From the hole further，the attenuation coefficient of stress wave is smaller.In air-decked charge，the damage depth is up as the decrease of the air ratio.The rock surrounding by air is not obvious failure，because the pressure of the hole wall is less than the dynamic compressive strength of rock.In discontinuous air-decked charge，the load strength and damage radius is decrease when the decoupling coefficient is increase.