Abstract: In this paper,high heat penetration into a moving particulate bed is described mathematically with a comprehensive heat and mass transfer model.The distribution of gas velocity and pressure,the temperature field of gas and solid in the moving particulate bed are examined for different conditions.The results show that thermal penetration into the moving packed-bed particles by fluid flow in porous media is high only in the position near the gas entrance.The thermal penetration thickness tends to increase with the fluid flow velocity and decrease with the particle moving velocity.In the region of thermal penetration,the porosity of solid bed has significant effect on gas field and pressure loss.it is feasible to reduce the gas pressure loss by a larger width/height packed bed in design and operation.The correspondence between thermal infection depth and particle bed height would be helpful to keep high oapacity of reactor and reduce the cost of operation.