Abstract: To study the influence of dynamic disturbance of blasting on deep tunnel engineering, numerical simulation of deep tunnel under blasting load is carried out by using PFC. The damage evolution process of surrounding rock of tunnel in different buried depths and the change laws of particle displacement and stress of surrounding rock of tunnel in the same depth are analyzed.The results show that the damage of rock on both sides of tunnel is more serious than other areas when blasting load is applied on the top surface of the tunnel rock model. With the increase of buried depth, the damage firstly appears on both sides of tunnel and then gradually extends from the right side to the roof of tunnel. The failure of tunnel is mainly caused by blasting load and in situ stress, blasting load results in joints of surrounding rock where rock spalling and ejection may finally occur because of the constant in-situ stress.