Thermal-pressure aging treatment was used in the study on cracks healing behavior of PBX, combined with μCT, ultrasonic testing method and mechanical properties testing method. Results show that cracks blow 400 μm heales after treated, and its tensile strength and compressive strength are close to those of same density sample without damage while the crack in excess of 400 μm couldn′t heal. It indicats the treatmeet improves the internal quality of the damaged samples effectively in certain conditions. The width of cracks will affect the healing results.