In order to measure the shock initiation behavior of JOB-9003 explosives, Al-based embedded multiple electromagnetic particle velocity gauge technique has been developed. In addition, a gauge element called the shock tracker has been used to monitor the progress of the shock front as a function of time, thus providing a positionetime trajectory of the wave front as it moves through the explosive sample. the data is used to determine the position and time for shock to detonation transition. All the experimental results show that the rising-up time of Al-based electromagnetic particle velocity gauge is very short (<20 ns); the reaction-build-up velocity pro.les and the positionetime for shock to detonation transition of HMX-based plastic bonded explosive (PBX) JOB-9003 with 1-8 mm depth from the origin of the impact plane under different initiation pressures were obtained with high accuracy.