In order to determine the stability of surrounding rock or the safety of concrete lining under blasting load

this paper adopted ANSYS/LS-DYNA software to analyze the dynamic response of rock mass under blasting vibration load when rock tunnel excavation with drilling and blasting methods . The results show that the attenuation law of blasting pressure，element effective stress and particle vibration velocity can be expressed by Sadaovsky empirical formula approximately

the attenuation law of particle vibration velocity and element effective stress have well relationship. Particle vibration velocity on the surface of surrounding rock is mainly along the axis of tunnel

and which is less along the normal line

and the least is on the surface. All particles on the same cross section have the same vibration wave shapes. The maximum particle vibration velocity on the arc is larger by 10% than on the wall slope

and that of conjunction is the least. The maximum particle vibration velocity of all nodes along the axis of tunnel attenuates according to Sadaovsky empirical formula. All the results are helpful to analyze the influence of blasting vibration field when excavating tunnel with drilling and blasting methods.