Abstract: Studies the ignition mode of solid propellant processed with high-pressure waterjet.Using piezoelectricity,thermoelectric couple and scanning electron microscope,the pressure peak,temperature rise and components variation of hydroyl-terminated polybutadiene(HTPB) solid propellant processed with high-pressure waterjet are measured experimentally.Ignition modes of HTPB solid propellant processed with high-pressure waterjet are theoretically analyzed.The results showed that HTPB solid propellant containing ferrocene has three ignition modes when processed with high-pressure waterjet,and the mode in which a mixed system comprising ammonium perchlorate,ferrocene and vapor is ignited by mechanical spark or electrostatic spark is most likely to occur.