Abstract: HA—K produced a great on corn development and factors forming yield. The results indicated that there was greatly relativity (from o.8434 to 0.9997)between seed soaked with diffrent concentration of HA—K and seedling development, that average plant height, ear-site Height , stem thickness, ear lengh, number of grains in a ear, weight per 1000 corn grains and total yield increased in turn by 5.04cm, 5.12cm, 0.072cm, 0.983cm, 0.2616cm, 57.74grains,28.303 gram. And 24.79 per cent than the control. But the bare top of corn ear decreased by 3.164 per cont than the control . The effect of concentration X2 On development and factors forming yield exceeded that of concentration X1. And optimum concentration of HA—K as follows: from 576.6 to 1369.7mg/kg as seed soaked with it; From 903.4 to 1617.9mg/kg as it was sprayed on corn leaves.