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为研究氧化石墨烯（GO）对聚叠氮缩水甘油醚（GAP）改性球形药复合材料膨胀系数的影响，制备了含0%、0.5%、1%和1.5% GO的GAP改性球形药复合材料，采用傅里叶变换红外光谱（FTIR）、扫描电子显微镜（SEM）和差示扫描量热仪（DSC）分别研究了GAP改性球形药复合材料结构、形貌和热性能，采用静态热机械测试仪（TMA）研究了GO含量对热膨胀系数及玻璃化转变温度的影响。结果表明：GO的添加对固化体系结构及热性能无明显影响，并未发生化学反应；GO的添加可使GAP改性球形药复合材料膨胀系数减小，当添加1% GO时，膨胀系数从3.236×10-4 K-1下降到2.692×10-4 K-1，减小的幅度最大；相对于含0% GO的GAP改性球形药复合材料，随着GO含量的添加，玻璃化转变温度由20.8 ℃升高到25.1 ℃。“,”In order to investigate the effects of graphene oxide （GO） on the thermal expansion coefficient of GAP modified spherical propellant composites， GAP modified spherical propellant composites containing GO with 0%， 0.5%， 1%， 1.5% were prepared， respectively. Fourier transform infrared spectroscopy （FTIR）， scanning electron microscopy （SEM） and differential scanning calorimetry （DSC） were used to investigate the structure， morphology and thermal properties of the composites， respectively. The effect of GO content on thermal expansion coefficient and glass transition temperature was investigated using a static thermomechanical tester （TMA）. The results showed that the addition of GO had little significant effect on the structure and thermal properties of the cured system and no chemical reaction occurred. The addition of GO resulted in a reduction to the expansion coefficient of the composites. When the content of GO is 1%， the expansion coefficient presents the greatest reduction， decreasing from 3.236×10-4 K-1 to 2.692×10-4 K-1. The glass transition temperature increased from 20.8 ℃ to 25.1 ℃ with the addition of GO content relative to the pure GAP modified spherical propellant composite.