The experiment was conducted in order to improve the vase life of Dendrobium orchid (Cultivar: Sonia 17) by using some chemical preservative solutions viz. T0: Tap water (Control); T1: Sugar (50-ppm); T2: Citric Acid (50-ppm); T3: Salicylic Acid (50-ppm); T4: Chitosan (50-ppm); T5: Silvar Thiosulphate (50-ppm); T6: Sugar + Citric Acid (50-ppm); T7: Sugar + Salicylic Acid (50-ppm); T8: Sugar + Chitosan (50-ppm) and T9: Sugar + Silvar Thiosulphate (50-ppm) were used as vase solution. Results demonstrated that maximum floret opening (78.3%), first floret wilting (8.3 days), first petal dropping (10.1 days), solution uptake (52.3 ml), petal water content (52.9%) and vase life (29.3 days) were found from treatment T9 which was followed by T7. It was observed that 50-ppm of Sugar and Silvar Thiosulphate mixture has a great potentiality to prolonging the vase life and increasing the keeping quality of dendrobium Sonia 17.