More and more attention is being payed to the researches on damage and relative problems of high polymer bonded explosives(PBX). In the paper,an experimental research on thermal shock damage of PBX JOB-9003 specimens has been done by using water-bathed thermal shock and ultrasonic charaterization testing techniques,and a comparatively typical correlation among the thermal shock temperature difference,the specimen′s percentage of damage and the ultrasonic gain is revealed.