The polymer-bonded explosive(PBX) charge structures of certain ammunitions stored for 4, 8, 12, 16 years were investigated by CT scanning.The composition, density and precipitates of different storage periods were analyzed by gravimetric method, hydrostatic weighing method and IR.Simultaneously, the charge micro structures stored for 4, 12 and 16 years were observed by SEM.And the impact sensitivity was also investigated.Results indicate that PBX charge appears cracks, holes and cavities after long term storage.Meanwhile, the charge state is changed from sticky to solid along with silicon rubber separated out, and the rupture surface of charg changes from smooth to uneven.And also, the density, HMX content and impact sensitivity of charge storage for 4 years increase from 1.56 g·cm^-3 to 1.66 g·cm^-3 of charge storage for 16 years, 85% to 95% and 8% to 44%.The cracks may be caused by detachment of explosive particles from binder and microcracks propagation.And aging phenomenon of holes and cavities maybe appeared due to degradation of adhesive molecular network structure into small cyclic molecule.