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Abstract. In this study, corn seeding unit was designed and evaluated. The physical and mechanical properties of two varieties of grain and corn maize were measured. Then, seed separator unit (thrasher) was evaluated for three-toed flapper (the tip of the square, circle and triangle) according to the force and torque. The appropriate design (triangular) was selected. Test and evaluation were done for two varieties of corn (KSC 704 and SNK 600) in the range of 13-15% and 20-24% MC and three cylindrical thrasher speed (rpm 140, 280 and 400) at five replications. The results showed that the capacity of Sheller for KSC 704 and SNK 600 are 50.9 and 31.53Kg/hr respectively. The best performance is 91.95% for KSC 704 at 400rpm and initial moisture content. The highest efficiency of separation unit was calculated 66.91% for KSC 704 (400rpm and Initial MC). Total loss of system increased by increasing MC and rotation speed of thrasher. The lowest lost was occurred at 13-15% MC and 140 RPM.