Abstract: Plasticity damage theory was used to simulate the deformation and fracture process of PBX circular arch specimens subjected to compression. The bearing capacity and crack shape of specimens at constraint conditions were analyzed. The comparison between experiment and simulation shows that the bearing capacity of specimens rises with the increase of friction. Simulation results agree with the experiment data well when the friction coefficient equals to 0.2; the bearing capacity of specimens is greatly improved at restriction conditions, and the specimens can still bear loading when a crack appears; the specimens break twice at strong restriction when it comes to continued loading, and this process has been reproduced by simulation. The simulation have a good agreement with experimental results in terms of the shape of cracks and carrying capacity. So plasticity damage model can be used to analyze the deformation and fracture of PBX specimens.