Abstract: Due to flow speed, high total temperature and strong self-luminescence of typical particle erosion environments such as in the arc heater, it is difficult to measure the particle velocity field accurately. To meet the requirements of measuring particle velocity fields on the head of high-speed vehicles and in the throat of engines, this study developed a particle image velocimetry (PIV) technique based on high-temperature and strong self-luminescence particles. A narrowband filter was used to achieve spectral separation of particle scattered light, greatly suppressing the self-luminescence generated by the high-temperature airflow of the arc heater, thus images with high signal-to-noise ratio were obtained under high-speed flow.PIV measurements were conducted on Al₂O₃ particles with an average particle size of 20μm and graphite particles with an average particle size of 50μm. The measured total temperature ranged from 2150K to 3570K, and the highest measured particle velocity exceeded 1500m/s. Due to the free atmospheric environment of the outlet flow field of the arc heater, there were obvious low-speed shear boundaries in the erosion simulation jet. By analyzing and comparing the particle velocity and vorticity distribution at the outlet under different inflow conditions, the boundary characteristics of the jet were obtained, providing detailed data basis for the precise verification of particle erosion experiments.