This paper deals with the ignition process of the base bleed grain consisting of NH_4ClO_4 (AP) and hydro-terminated polybutadiene (HTPB) by the GC-45 igniter with the ignition composition ZrH_2+PbO_2 and modified igniter with the ignition composition Mg-PTFE. The simulation device of ignition instantaneity and the rotated combustion interruption device are used in the experiment. It is proved in the experiment that the GC-45 igniter has the problem of long ignition delay and heavy ablation when it used to ignite the AP/HTPB base bleed grain, and the problems are the important reason decreased ranger and ballistic precision. It is suggested that the igniter should be improved.
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