Abstract: This study investigated the fresh-keeping effects of vasing treatments with a novel bactericide, ionic nano-silver（NS）, and its combination with citric acid and sucrose, on the cut spray carnations（Dianthus caryophyllus L.） 'Prince'. The results showed that, compared with control（using deionized water as the vase solution）, the separate treatment of ionized NS, the combination of ionized NS and citric acid, and the combination of ionized NS and citric acid with sucrose could prolong the vase life and improve the ornamental quality of cut spray carnations to varying degrees, and effectively maintain their fresh weight and water balance. Among them, the treatment with 5 mg·L⁻¹ ionic NS + 200 mg·L⁻¹ citric acid + 3% sucrose were the best, which could effectively maintain the fresh weight and water balance of cut carnations, and also increase flower opening rates. Their florets opened fully, displayed vibrant colors, and emitted a pleasant fragrance. The experimental results demonstrated that the treatments with suitable concentration of ionic NS combined with citric acid and sucrose in vase solution hold promising potential for preservation of cut carnation 'Prince'.