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This study was conducted to determine gene action type for different traits of corn with the use of 5 inbred lines and their crosses (direct-crosses) in a completely randomized block design with 4 replications. Analysis with Hayman's method showed that gene action for yield, days to 50% silking, days to pollination, plant height, days to physiological maturity, days to full maturity, ear diameter, No. of kernel/row, kernel depth, 1000 kernel weight, ear height from soil level there is over dominance but for No. of leaves above the ear, No. of kernel rows and wood percentage there is partial dominance. It is necessary to increase the number of genes with dominant effects to better express breeding behavior for characters such as: days to silking, days to pollination, days to physiological maturity, days to full maturity, wood percentage, yield, ear length, ear diameter, No. of kernels/row, kernel depth, ear height from soil level; number of genes with recessive effects should be increased to express the better breeding behavior for characters such as: No. of leaves above the ear, plant height, kernel row and 1000 kernel weight.