Abstract: The effect of microwave treatment on respiratory physiology and nutrition quality of Sagittaria sagittifolia during postharvest storage stage was examined. Fresh Sagittaria sagittifolia planted in Jiangsu Baoying was chosen as experimental material.After pre-treatment by microwave 120W/60 s or without pre-treatment, Sagittaria sagittifolia was packed with PE breathable bag, stored in ( 25 ± 5) ℃ and ( 4 ± 0.5) ℃ respectively. Samples were analyzed for the respiratory rate, weightlessness rate, hardness, total soluble solids content and starch every 5d during storage period. The result showed that microsoft treatment efficiently inhibited respiration rate and weightlessness, significantly delayed the reduction of firmness and the rise of TSS of Sagittaria sagittifolia, maintained the better quality.However, the impact of microwave treatment on starch of Sagittaria sagittifolia content had not significant change.