Abstract: Char particle gasification belongs to a classic noncatalytic gas-solid reaction.The soild structure would be changed with reaction, so a structural factor reflecting the surface area evolution of the soild particle was considered in the particle gasification model. The detailed diffusion-reaction model of a char particle gasification with carbon dioxide was developed, which is limited in the kinetics controlling region.  A simple structural factor was adopted in the reaction rate term of the model. The modeling results show a good accuracy comparing with that of Random Pore Model. Moreover, the carbon conversion of a particle with a different initial porosity as well as the influence of gasification temperature and reactant partial pressure were  investigated.