Abstract: Based on HJC constitutive model, the LS-DYNA finite element numerical simulation of coal and rock mass is carried out, and the influence of dynamic load strain rate on the damage of coal and rock mass is analyzed. The results show that the working time of load under the same maximum load pressure can affect the damage of coal and rock mass more than the load strain rate, and the maximum energy of destruction of coal and rock mass decreases with the increase of load strain rate. The time of destruction decreases with the increase of load strain rate, and the greater the energy is, the greater the damage is. The pressure of destruction of coal and rock mass increases with the increase of load strain rate, the strain is consistent with the damage degree of coal and rock mass.