The impact load was applied to azido polyether propellant by the instrumented drop hammer device at -40 ℃. The impact damage of the sample was characterized by X-ray micro-tomography (X-μCT), and the dynamic mechanical properties of the propellant sample were studied by dynamic mechanical analyzer at different loading frequencies. Results show that the dynamic mechanical properties of azido polyether propellant exhibit obviously loading frequency-dependent and the glass transition temperature increases from -38.1 ℃ to -23.1 ℃ when the loading frequency varies from 1 Hz to 20 Hz. The propellant samples have no macroscopic crack with the impact energy below 2 J, but part of the perchlorate amine(AP) particles inside have been broken; and the propellant samples break with the impact energy increasing. The test curves of broken samples contain unstable crack growth which indicates the partial brittle material character of azido polyether propellant. The whole process of the fracture of azido polyether propellant is that the initial micro cracks was formed in the AP particles with defects, extend to large macroscopic cracks in the basal body, and then the propellant samples broke.