The ageing research of insensitive RDX (I-RDX) and polymer bonded explosive (PBX) were reviewed. The crystal characteristics of RDX and evaluation methods, and the crystal characteristics and impact sensitivities of I-RDX and I-RDX based PBX before and after aging were summarized. The impact sensitivities of I-RDX crystal without cyclotetramethylene tetranitramine (HMX) or with a little HMX, or with blending some HMX, have no evident change. Influence mechanism of HMX in I-RDX crystal was discussed.