Abstract: In the text,We used gibberellin CaCl2 and the compound of gibberellin and CaCl2 in which each counted 50 percentaye to treat Zea may L.seeds . Then we studied the effects of every treatment on the vigor of Zea mays L. seeds on germination enery, gemination percertage and simplifced vigor index, weight of dry roots and seedings and the lengths of the seedings.The resules showed that, except germination percentage, the other levels of each treatment were higher than those of the contrast. The germination energy and the simplified vigor index increased firstly and then decreased with the in crease of density. We didn’t find the effects of Ca2+ and gibberellin were additive in the enhancement of seed vigor.