The aim of this research is to study some factors affecting the mechanical coating of maize seeds. The studied factors are coating temperature of 30, 40, 50, 60, and 70 C^o, coating speeds of 20, 28, and 36 rpm, coating times of 15, 20, 30, 40, 50. And 60 minute, batch masses of 0.5, 1, 1.5, 2 and 2.5 kg, and coating materials of clay, “Fe + Zn" and “Fe + Zn + Arsan". The main results in this study can be summarized in the following points: - The maximum germinations maize seeds were 89.5, 99.6 and 89.7 % for coating-unit speed of 28 rpm, coating time of 15 minute, coating temperature of 30 C^o with their different coating treatments coating with “Fe + Zn", “Fe + Zn + Arsan" and clay respectively. Meanwhile, the minimum maize seed germinations of 22.5, 37.8 and 14.7 % were obtain at coating-unit speed of 36 rpm, coating time of 60 minute, coating temperature of 70 C^o and coating with the same coating mechanicals respectively. - The maximum machine capacity of maize seeds coated was 9.2 kg/h was obtained using seeds-batch mass of 2.5 kg and coating-unit speed of 36 rpm. Meanwhile, the minimum machine capacity of maize seeds coated was 0.85 kg/h using seeds-batch mass of 0.5 kg and coating-unit speed of 20 rpm. - The operation and production costs at optimum parameters batch mass of 2.5 kg, coating-unit speed 28 rpm, coating temperature of 30 ⁰C, coating time of 15 minutes and coating with “Fe + Zn + Arsan" were 17.02 L. E./h and 1850 L.E./ton.