New researches try to define the ideal combination of aging for several species and some of the existent recommendations continue being refined. This way the work had as objective to evaluate the effect of temperature and period of exposure combinations of the on seeds of hybrid corn in the test of accelerated aging. Treated seeds of four genotypes of hybrid corn were used. The accelerated aging test was conducted following the method of the gerbox and the adopted combinations were: 42oC for 72 hours; 42oC for 96 hours; 45oC for 72 hours and 45oC for 96 hours, all with close relative humidity of 100%. After the aging treatment it was proceeded the determination of the moisture content and the evaluation of the germination percentage and, also, field emergence. In the statistical analysis a complete randomized design was used, with four replications for each seed lot. The data were submitted to the analysis of variance and to F test being used the factorial outline 2x2x8, with two temperatures (42 and 45oC), two periods of seed exposure (72 and 96 hours) and eight lots of four genotypes of hybrid corn (D-170 lots 1 and 2,
D-556 lots 3 and 4, D-766 lots 5 and 6 and D-769 lots 7 and 8). The averages were compared by the Tukey test, at 5% of probability. The temperature increase decreased the germination and field emergence after seed aging, independent of the exposure period of the seeds in the test. The combination of the temperature of 45oC and the period of 72 hours of exposure of seeds in the aging accelerated test, showed to be more adequate, without any disadvantage in the interpretation of the final results, in the evaluation of the vigor of hybrid corn seeds.