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In order to research the effect of creep behavior and creep mechanical property of composite solid propellant on the structural integrity of long storage solid rocket motor, the semi-electronic compression creep experimental device and experimental method are designed. Then short-term and long-term compression creep experiments were carried out. Based on the experimental results, the compression deformation law of propellant was analysed. The results show that in the short-term compressive creep experiment, the stress-strain relationship of the propellant is still in the linear stage under the stress level of 0.5MPa. In the long-term compressive creep experiment, the stress-strain relationship is obviously nonlinear at the stress level of 0.25MPa. Long-term creep can result in a substantial reduction in propellant failure stress. Long-term creep will lead to large deformation of the propellant and plastic deformation even at relatively low stress level, which will adversely affect the motor structure.
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