The experiment was conducted with the design of random-blocks experiment and‘Chifeng 1’usedas materials to study the effect of plant density on growth and seed production characteristics of buckwheat. The re-sults showed that the 100-grain weight and average seed rate of buckwheat increased with the planting density. Theshattering rate of buckwheat was reduced at first and then increased as plant density increased. The correlation anal-ysis indicated that total grain weight and effective plant number was significantly negatively correlated with shatter-ing rate. Agronomic index and grain rate were not significant correlation with seed setting rate. Therefore in order toreduce shattering rate, the suitable density of buckwheat should be in 3×10⁵ plants/hm².