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Cleaning is one important function of a peanut harvester. In order to study the effect of variations in main design parameters of the cleaning chamber of a peanut harvester, flow simulation function built in SolidWorks was applied to simulate the air flow field based on the different angles of fan (15, 30, 45), air speed at the outlet of the fan (10 m/s, 15 m/s), and the distance from the top of the chamber to the top surface of the sieve (400mm, 500mm). Simulation results indicated that the fan angle of 30resulted in the best cleaning effectiveness. Increasing and/or decreasing this angle would reduce the air speed right above the top surface of the sieve. This speed reduction will then reduce the cleaning rate. Further experimental verifications are needed.