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为研究炸药老化后对武器可靠性和安全性的影响，按照GJB736.8‑90火工品试验方法71 ℃试验法对HNIW/FOX‑7基高能低易损性压装PBX进行了7、14、21 d以及28 d的老化试验。对老化前后PBX造型粉的表观形貌和热分解性能进行了表征，且对造型粉进行了FTIR和XRD测试，测定了PBX药柱老化前后的尺寸和质量变化率及力学性能变化。结果表明，老化后HNIW/FOX‑7基PBX药柱仍有效，质量变化率和尺寸变化率均小于1%，符合美军标MIL‑STD‑1751的评价标准；老化PBX造型粉表面形貌随着老化时间增加，裂纹增多，不平整；但PBX造型粉的分子结构和晶型未改变；随着老化时间的增加，其活化能下降都不超过10%，具有较好的热稳定性；老化7、14、21 d以及28 d后HNIW基PBX的抗压强度（σc）分别增加3.18、3.40、3.67 MPa和3.79 MPa，弹性模量（E）分别增加0.65、0.79、0.91 GPa和0.96 GPa，σc、E的变化率与老化时间成正相关，经老化试验后PBX药柱的抗压强度增加。“,”The HNIW/FOX‑7‑based PBX has been aged 7， 14， 21 d and 28 d at 71 ℃ according to GJB736.8-90 initiators and pyrotechnics test method， respectively. And the morphology and thermal decomposition properties of PBX molding powder before and after aging were characterized. The PBX molding powder was tested by FTIR and XRD. The variations of size， mass and mechanical properties of the PBX columns have been measured before and after aging tests. Results show that the mass and size change rate are both within 1%， which meets the evaluation standard of MIL‑STD‑1751， indicating that PBX columns are still at an acceptable level after aging tests. The surface morphology of PBX molding powders has changed in varying degrees. There are more surface cracks and the surface morphology are more uneven with the increase of aging time. Moreover， FTIR and XRD results indicate that the molecular structure and crystal form of HNIW/FOX‑based PBX have not changed after aging tests. Besides， the analyses of thermal decomposition performance show that the thermal decomposition activation energy of PBX molding powders have decreased after aging tests with the decreases of -5.23%， -5.88%， -7.00% and -8.23%， respectively， which demonstrates that PBX still has good thermal stability after aging tests. The results of mechanical properties show that the compressive strength of HNIW/FOX‑7‑based PBX increases by 3.18， 3.40， 3.67 MPa and 3.79 MPa， respectively， and the modulus increases by 0.65， 0.79， 0.91 GPa and 0.96 GPa respectively after aging for 7， 14， 21 d and 28 d. Therefore， the change rate of compressive strength and elastic modulus of PBX columns are positively correlated with the aging time， indicating that the compressive strength of PBX columns increases after aging test.