This paper deals with the ignition process of the base bleed grain consisting of NH₄ClO₄ (AP) and hydro-terminated polybutadiene (HTPB) by the GC-45 igniter with the ignition composition ZrH₂+PbO₂ 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 is used to ignite the AP/HTPB base bleed grain, and the problems are the important reason that decreased range and ballistic precision. It is suggested that the igniter should be improved.