Abstract: Based on the bench-scale opposed multi-burner（OMB） gasification experimental platform, particles near the burner plane was sampled firstly. Then the high frequency furnace was adopted to heat the particles inside the gasifier so as to research the influence of high temperature process on particle morphology changes. Malvern particle size analyzer was used to explore particle size distribution and the change of average volume particle size. Specific surface area and porosity analyzer was employed to explore the specific surface area variations of particles, and scanning electron microscopy（SEM） was used to characterize the apparent morphology of particles. The results show that with the continuous high temperature process, the particle surface becomes rougher and the pore structure becomes more complicated. High temperature process will lead to the inactivation and fracture of pore structure of particles. Additionally, it was also found that particles with larger particle size showed more possibility of secondary fragmentation.