Abstract: The study aims to clarify the optimum density of‘Longping 206’variety in Huaibei Area and provide theoretical basis for supporting the good seed. Field experiment was carried out to investigate the effects of different densities on yield, agronomy traits and ear characters, and was arranged in a single factor randomized block design. The results showed that during the density of 30000 to 75000 plants/hm², with the increase of density, the yield increased significantly, when the density reached 75000 plants/hm², the yield reached maximum; but during the density of 75000 to 120000 plants/hm², the yield decreased significantly with the increase of density, but there was no significant difference among the treatment of 75000, 60000 and 90000 plants/hm². The equation of density and yield, y=0.31036xe(- 0.000012182x) (r=0.994**) revealed that the maximum productivity of plant could not exceed 310.36 g, the density of maximum yield was 82085 plants/hm² and the maximum theoretical yield was 9372.4 kg/hm². With the increase of planting density, the plant height, ear height, lodging rate and empty stalk rate increased significantly. Double ear rate, ear length, row number and 1000-grain weight were decreased significantly. The optimum density of‘Longping 206’in Huaibei Area was 60652 plants/hm².