An experimental device of gas-solid impinging streams was built up to study particle rotation characteristics. High-speed video camera system was used to observe particle motion in area of 0.15 m × 0.08 m. The influence factors of particle rotation were studied by using this experimental device with single injection or double injections. The particle rotation characteristics was obtained by analyzing those research data. The results showed that the particles always rotated when moving along the gas-solid impinging streams. The influence of gas on particle rotation was relatively small

and therefore it can be ignored. The average rotation speed of particles with smaller diameter was higher than that with greater diameter under same experimental conditions. Those particles with relatively higher velocity before collision were inclined to have a higher rotational speed after collision. The average difference between particle rotation speeds before and after collision can reach 280 r·s-1 at gas velocity 25 m·s-1 and diameter of alumina cement 0.003 m. The direction of particle motion has little influence on the particle rotation speed during collision.