A multi-fluid Eulerian model with the kinetic theory of granular mixture (KTGM) is employed for multi-component particles to simulate the coal/biomass co-gasification process in the internal circulating fluidized bed (ICFB). The hydrodynamic characteristic and chemical reaction kinetics are analyzed. The simulations with the KTGM model are in good agreement with experimental data. The instantaneous variables of volume fraction of particles, molar fraction of gas, molar concentration of carbon and temperature are described for the coal/biomass co-gasification process. The time-averaged distributions of volume fraction and velocity for both coal and biomass particles are given. The profiles of granular temperature with solid volume fraction and temperature are also discussed. The results reveal that the granular temperatures of both biomass and coal particles are obvious at a high temperature and a low solid volume fraction. Biomass particles have a higher granular temperature compared to coal particles. (C) 2017 Elsevier Ltd. All rights reserved.