Coke combustion is the main process of pulverized coal combustion in coal-fired power plant boilers, and its combustion process consists of power combustion zone, diffusion/dynamic zone and diffusion control zone, among which the combustion process and mechanism in the diffusion/dynamic zone are the most complicated and often affect the accuracy of numerical simulation of coke combustion. To further improve the accuracy of the numerical simulation on the boiler side of coal-fired power plants, the FLUENT self-contained model, the improved random hole model and the existing improved model for coke combustion were reviewed and compared. The results show that the self-contained model of FLUENT does not consider the influence of ash on oxygen diffusion during actual combustion, resulting in large differences between numerical simulation and engineering practice.Based on the improved random pore model, it is considered that temperature is the reason for the difficulty of oxygen contact with coke in the diffusion zone, but it is not the fundamental factor.The existing models generally do not consider the influence of internal surface area on the reaction rate when burning poor quality coal in engineering practice, resulting in large differences between predicted and actual values at the stage of low conversion rate.In the application of nucleation model considering the diffusion resistance of ash layer, the softening temperature of combustion coal with the combustion temperature should be compared first, and the consideration of thermal deactivation and the internal surface area of porous carbon spheres should be considered.The thermal deactivation and ash suppression model should adopt a more suitable ash suppression model to improve the accuracy of model prediction.At present, in the numerical simulation of other problems of coal-fired boiler based on FLUENT, the diffusion/dynamic models with large errors are used, and the adoption of improved coke combustion models in subsequent studies is an important research direction.