The objective of the field experiment is to study the seedling rate of mechanized sowing spring maizeunder condition of high-density planting in Jilin province. In the present experiment, we employed four cultivars,CI6502, M752, XY335, and XY420, and used randomized block design to investigate measures of improving seed-ling rate in field experiment with five populations in Jilin Province. The main conclusions were as followed: meanseedling rate was about 85%~94% with planting machine of John Deer’s 1030 planter. However, it was about 79%~88% with domestic small planter（2BZF-2, Kangda Jilin Agricultural Machinery Company）. When plantingdensity in theory was less than 70 000 plants per hectare, the number of seeds should be 8%~10% higher than theactual amount of populations in order to ensure the planned density. When populations in theory were higher than 70 000 plants per hectare, 12%~15% more was needed. Using domestic small planter in verification of experimentin 2014, field actual seeding rate was 13%~15% higher than the plan planting density when planting density waslow（＜ 70 000 plants/hm²）; the actual seeding rate was 17%~20% higher than the planting density when plantingdensity was high（＞ 70 000 plants/hm²）. Strategies to improve the seedling rate under condition of high-density withmachine sowing were proposed, which were meticulous tillage, sowing timely, planting carefully, and an appropriateincrease in seed quantity.