To screen the suitable planting density and nitrogen and potassium fertilizer application level of Xuzishu 8，planting density(D，52500，60000，and 67500 plants·hm-2)，nitrogen fertilizer(N，0，45，and 90 kg·hm-2)，and potassium(K2O) fertilizer(K，0，120，and 240 kg·hm-2)were chosen as influential factors，and an orthogonal experiment with three factors was devised. The impact of various treatment combinations on the yield，nutritional quality and starch paste characteristics of Xuzishu 8 were assessed through range analysis，variance analysis，and multiple comparison. Subsequently，an optimal cultivation strategy was determined. The results revealed that，(1)Planting density and potassium fertilizer levels significantly influenced the storage root yield of Xuzishu 8，and planting density level had a significant effect on the shoot biomass and root-shoot ratio. In both years studied(2022 and 2023)，the highest yield was observed in treatment group D3N1K3，which was significantly higher than that in the lowest yield group D1N1K1 by 44.1% and 28.8%，respectively. The results of range analysis showed that the three factors affecting the tuber yield were in the order of density > potassium fertilizer > nitrogen fertilizer，and the optimal combination was D3N2K3.(2)Nitrogen fertilizer had the greatest effect on the contents of starch，reducing sugar and protein(R values were 24.9，15.9 and 9.0，respectively)，and density had the greatest effect on the content of soluble sugar(R=20.1). The combination with the highest content of reducing sugar and soluble sugar was D3N1K3，and the results of multiple comparison analysis and range analysis was consistent.(3)The peak viscosity，hot pulp viscosity and cold pulp viscosity of starch paste were the highest in D3N3K2 treatment group(6578，3252 and 4349 cP，respectively)，while the highest treatment combination predicted by range analysis was D3N3K3.(4)The regression curve equation revealed that the maximum storage root yield of 27.07 t·hm-2 could be achieved at a density of 67500 plants(D3)，nitrogen level of 48 kg·hm-2(close to N2)，and potassium level of 240 kg·hm-2(K3). However，there was some impact on the nutritional and starch quality. In conclusion，the optimal treatment combination with the yield of Xuzishu 8 as the target was D3N2K3(density 67500 plants·hm-2，N 48 kg·hm-2，and K2O 240 kg·hm-2)，and the amount of nitrogen fertilizer should be adjusted according to the edible or starch quality requirements.