Abstract: By research the optimal plant density and fertilizer amount on the maize varieties‘Longdan 63’, itcould provide a basis for stable high-yield maize‘Longdan 63’. The effects of different plant density and fertilizer level on the yield and agronomic characters were studied with the varieties‘Longdan 63’as materials by means of randomized complete block design of two factors. The experimental data showed that under the same culture condition, the agronomic characters and yield of‘Longdan 63’had been improved and increased with the increase of fertilizer amount and density, plant height, ear position and barren ear tip length were increased continuously, ear length and ear diameter were reduced, ear rows and row grains changed nothing, the change of production existed the different differences. Moreover, the highest yield was up to 12251.27 kg/hm2 on the condition of (NH4)H2PO4, CO(NH2)2 and KCL were 300 kg/hm2, 300 kg/hm2 and 100 kg/hm2 and HA seedlings of 76920 strains. Therefore, the maize varieties‘Longdan 63’was more dense planting resistant, planting density should be controlled in 76920 plants/hm2 advisable, fertilizer amount should be controlled between B and C fertility levels.