Abstract: In the operation of pressurized water reactor, fuel rods, reactor vessel internals and other components are scoured by high pressure supercooled coolant, and are also affected by the flow accelerated corrosion of fluid in pipeline. Insoluble corrosion products will be produced under these conditions, whose movement and deposition in the core will have a great influence on the safety and economy of PWR. Therefore, the study on the deposition of insoluble granular corrosion products in the core of PWR plays an important role in further alleviating and preventing the corrosion in PWR. A numerical simulation method for particle deposition in the channel of fuel rod bundles in the core of PWR is presented. A granular corrosion products flow-deposition mathematical and physical model is constructed based on the standard k-ε model and discrete phase model（DPM）. Combined with the experimental results of particle flow-deposition characteristics, the applicability of the granular corrosion products flow-deposition model is verified. The research about the flow and deposition of the insoluble granular corrosion products in a channel of 5×5 rod bundles with a spacer grid is conducted and the deposition characteristics are obtained.The simulation results show that the particle concentration in the fluid decreases obviously after passing through the spacer grid and the particle concentration is higher on the solid walls at the inlet section while is more uniform at the outlet section.It is also showed that the particle deposition attached on large area on the surfaces at the inlet while the particles dot deposit on the surface of the spacer grid and the other surfaces of the rod bundles and walls.The simulation method presented in this paper can provide a reference for core safety and structure design under the condition of long-term operation of reactor core.