Tillers and planting densities were effected by maize genotypes, environment and field management.Tillers removed or not, suitable planting densities, all that made farmers confused. Based on that, 15 maize cultivars were elected from the recommend leadings cultivars by Jilin Province in 2021. Planting densities were set with 60,000, 70,000, 80,000 plants/ha, respectively. Yield with and without tillers were compared. Results showed that, planting densities and genotypes were the main factor which affect with yield. With suitable planting densities,it made no significant difference to yield whether tillers were. Planting densities, genotypes and tillers had no interaction effect with each other. Suitable planting densities were based on cultivar main characters. Increase planting density thoughtless may cause yield decline.