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In the coal boiler industry, cyclone is used to separate silica sands (as a fluidizing medium) from flue gas (combustion gas from furnace). A gas-solid separation system with turbulent swirling flow that occurs in the cyclone will cause erosion on the cyclone wall. Erosion can cause a decrease the performance and increase the maintenance cost of cyclone. CFD simulation was conducted on the actual cyclone dimensions used in the coal boiler industry with a diameter of 5120 mm and height of 13970 .It was performed using the Eulerian-Lagrangian approach with Reynolds Stress Model (RSM) for turbulence in the gas phase and Oka model for the erosion model. The inlet velocities ranged from 7 to 8 m/s and the solid rates ranged from 30 to 40 kg/s with silica sands as solid particles (diameter between 0,075 and 1,5 mm). This study will analyze the erosion rate on the cyclone wall at various gas inlet velocity and solid rate variations. at Selected local area , the results shown that the higher gas inlet velocity for the same solid rate will increase the erosion rate (about 25%) and the higher solid rate for the same velocity will also increase erosion rate on the cyclone wall (about 17%)