Abstract: To explore the suitable potassium fertilizer application scheme for local flue-cured tobacco production, by taking Yunyan 87, a main cultivated variety, as the test material, five gradient treatments of potassium carbonate replacing potassium sulfate were set up to systematically study the effects of different treatments on agronomic traits, economic traits, appearance quality, chemical components and sensory quality of flue-cured tobacco, and the optimal scheme was screened out by comprehensive index evaluation. The results showed that partial or total replacement of potassium sulfate with potassium carbonate had no significant effect on agronomic and economic traits of flue-cured tobacco. Both single application of potassium sulfate (T1 treatment) and complete replacement of potassium sulfate with potassium carbonate (T5 treatment) had adverse effects on the quality of tobacco leaves, while partial replacement treatments could significantly improve the quality. Among them, the T2 treatment （potassium carbonate 41.25 kg·hm⁻² + potassium sulfate 168.75 kg·hm⁻²) showed the best coordination of chemical components and the highest sensory quality of tobacco leaves, with the highest comprehensive score. The study suggested that, T2 treatment (potassium carbonate 41.25 kg·hm⁻² + potassium sulfate 168.75 kg·hm⁻²) could not only ensure the supply of sulfur, but also give full play to the advantages of potassium carbonate, which could be used as the optimal potassium fertilizer application scheme for Yunyan 87 in Ji’an area.