Abstract: In order to understand the factors of different age period of fertilizer on maize growth and development, yield etc., master the local best dressing period of maize, So as to provide technical guidance for local corn planting. This experiment mainly in maize leaf development, leaf expansion, 7 leaf expansion, nine exhibition leaf of different leaf age period dressing through the investigation and analysis of comprehensive traits in maize growth period, morphological index and yield factors. The results showed that, the best time for Topdressing of 9 maize leaf; with CK 85.8kg/ mu, and the late growth stage of maize growing well. In 9 maize leaf fertilizer yield up to 773.8 kg/mu higher than the control 85.8 kg/mu, the ear height of maize was between 80-9 0cm. Lodging resistance was strong, the comprehensive character is better. It is the best time to 9 corn leaf fertilizer. Maize leaf expansion fertilizer treatment in the early stage of corn growth is rapidder, 2, 3, 4 day long, leading to ear height increases, higher plant height, prone to lodging, and the phenomenon of premature. 5 maize leaf, 6 leaf, 7 leaf fertilizer, plant characters of good performance, but the yield was not significantly increased compared with the control.