When the material is transported in the steel tube type scraper conveyor, the negative pressure effect is caused by the high-speed movement of the scraper, then the air enters and mixes with the material to make the material present a certain fluidization phenomenon, which helps to improve the effect of the rate of transport conveyor. Due to the complexity of the scraper conveyor model, based on the UDF dynamic mesh technology in FLUENT, the boundary of the scraper is realized in the runway shaped channel. The operation condition of the air flow field in the conveyor is obtained successfully, and then the numerical simulation of gas-solid two-phase flow is carried out to obtain the operating parameters and the volume distribution nephogram of the particles and air.