According to the possibility of detonating when ammunition is stimulated by heat in the process of storage, transportation and use, the response characteristics of fuze at different heating rates are studied. Taking the JHX-1 explosion-proof aerial bomb fuze as the research object, the influence of the heat conduction of the fuze cook-off and the position of the thermal insulation coating on the response characteristics of the fuze under different heating rates was studied, and the ignition position, ignition time and ignition temperature of the fuze were obtained. The results show that with the increase of heating rate, the ignition position will move from the center of the booster to the lower edge of the booster, and finally to the center of the detonator. The thickness of the fuze shell will affect the ignition position, and the ignition position will tend to the thinner side of the shell. The heating rate has little effect on the ignition temperature; The use of thermal barrier coating inside the fuze can reduce the ignition temperature, and the use of thermal barrier coating outside the fuze can prolong the ignition time.