The suitable planting density of Jishikui 3, SH363, Jishikui 5 were different in the western region of Jilin Province. When the planting density decreased from 33 300 plants/ha to 18 500 plants/ha, the yield per hectare of Jishikui 3 and SH363 decreased by 246 kg and 127.5 kg, respectively. The disc diameter and grain length of Jishikui 3 increased by 2.0 cm and 0.07 cm, respectively, and the change of cultivation density had little effect on it. The optimal planting density was 27 700 plants/ha. When the planting density was 23 800 plants/ha, the grain length of SH363 was 2.20 cm, and then had little effect, and the maximum growth was only 0.1 cm, so it was the optimal planting density. When the planting density of Jishikui 5 was 20 800 plants/ha, the disc diameter, grain length and single plate grain weight reached a higher level, which were 25.7 cm, 2.47 cm and 114.0 g, respectively. The yield per hectare of Jishikui 5 decreased by 190.5 kg with the continuous decrease of density. The suitable planting density of Jishikui 5 was 20 800 plants/ha.