In order to improve the performance of burning progressivity and low temperature sensitive coefficient effect of high-energy azidonitramine gun propellant, three insensitive high-energy azidonitramine gun propellants was prepared by the two-stepprocess with polymer composite materials plugging and energetic composite materials desensitization” (called plugged and insensitive gun propellant in this study), whose inner hole was blocked by polymer composite materials and surface was desensitized. The energetic and static combustion performance of plugged and insensitive gun propellant was investigated by heat of explosion and closed-bomb tests. Results show that compared with the untreated gun propellant, with the increase of the content of plugged and insensitive materials, the heat of explosion of three types of plugged and insensitive gun propellants (WCBF-1/18, WCBF-2/18, WCBF-3/18) decrease by 2.6%, 3.6%, 4.3%, and P_r values increase from 0.471 to 0.552, 0.563, 0.576 respectively. The average absolute values of temperature coefficient of relative combustion activity at high temperature for three types of plugged and insensitive gun propellants WCBF-1/18, WCBF-2/18, WCBF-3/18 are 2.87%, 1.89%, 1.56%, respectively, which are all lower than that of untreated gun propellant, it shows that the low temperature sensitivity coefficient effect in the high and normal temperature ranges for plugged and insensitive gun propellant can be improved.