Abstract: 【Objective】 The objective of this study is to explore the effects of the interaction between planting density and reduced fertilization on yield and correlation of edible sunflower (hereinafter referred to as shikui)in Ta’eken area,in order to obtain the optimal planting density and optimal fertilization rate of edible sunflower. 【Methods】 The experimental materials of Tongqing No. 5 cultivar were used to design the two-factor split plot of density and reduced fertilization,with 3 replicates,a total of 36 plots,the main area was the planting density,and 4 levels were set:M₁,M₂,M₃,M₄,and the sub-area was reduced fertilization,and 3 treatments:F₁(N 277 kg/hm²,P 115 kg/hm²,K 130 kg/hm²),F₂(10% reduction) and F₃(20% reduction) were set. The biological traits,economic traits and yield were measured at harvest time,and the effects of planting density and reduced fertilization on the biological traits,economic traits and yield of edible sunflower were calculated and analyzed. 【Results】 Under the same planting density,the plant height,flower disc diameter and stem diameter of sunflower were increased first and then decreased,and the effect was not significant,the plant height was 208.03 cm,220.4 cm,236.27 cm and 240.67 cm in F₂(10% weight loss),and the diameter of flower disc was the best,which was 21.91 cm,20.41 cm and 19.94 cm,respectively. 19.77 cm,the diameter diameter was the thickest,3.95 cm,3.87 cm,3.73 cm,3.61 cm,respectively,the plant height showed a significant effect between different density treatments,the plant height was the highest M₄ density of 240.34 cm,the stem diameter and the flower disc diameter showed a decreasing trend with the increase of planting density,the same density of chemical fertilizer application on the yield component factors of sunflower seed setting rate,single disc grain weight and 100 grain weight,under different densities had a significant effect on the yield factor. The results showed that the grain weight of the single disc of sunflower was between 177.62 g-187.43 g,The 100-grain weight was between 19.36 g-21.88 g,and all of them showed a decreasing trend with the increase of planting density. It can be seen that the effect of chemical fertilizer reduction on sunflower yield first increased and then decreased,and the average yield of F₂ was the highest under the same density condition,which was 3 976.94 kg/hm²,indicating that appropriate reduced fertilization played an important role in the improvement of sunflower yield. The interaction of planting density and reduced fertilization had a significant effect on the yield of edible sunflower,and the combined M₂F₂ treatment was the best,and the yield performance was the highest,which was 4 344.35 kg/hm²,the planting density of M₂F₂ treatment was 25 965 plants/hm²,and the chemical fertilizer reduction was 10%,i.e.,urea 450 kg/hm²,ethylenediamine phosphate 225 kg/hm²,and potassium sulfate 225 kg/hm². 【Conclusion】 In conclusion,the optimal combination of density and chemical fertilizer application rate in Ta’eken area was the best in M₂F₂ treatment,and the yield reached the highest(4 344.35 kg/hm²),and the yield component factor had obvious advantages,which showed that the seed setting rate reached the highest(82.06%) In summary,the combination of the optimal density and fertilizer application rate in the Taeken area was M₂F₂ treatment,which could be converted into better economic benefits,which was more suitable for the promotion of sunflower planting in the Taeken area,and provided scientific theoretical basis and technical support for the cultivation technology of sunflower in the Taeken area.