Abstract: Based on the experiments of exploding on the surface of the cement sample,the phenomenon of the rock damage and fracture by shock waves in exploding was simulated.Through optimizing the experiment schemes and analyzing the experiment phenomenon,the damage and fracture of the cement sample by the shock waves were qualitatively and quantitatively described and explained.The damage and fracture was closely related with the initial damage,and the fracture form was closely related with the ratio of explosive and sample scale.It was shown that the fracture on the prefab section could nearly substitute the inner fracture of samples.The compressive area with finite permeability was found through simple experiments.It would be helpful to investigation of fracture in exploding.