The study aims to analyze the mechanical property,moisturepenetrability, gas permeability, and preservation performance of biodegradablepolylactic acid (PLA)/poly(butylenesuccinate adipate) (PBSA) film added with grapefruit essential oil(GEO). The film was prepared through melt blending and extrusion casting method. By testing and analyzing firmness, total soluble solids content, pH, malondialdehyde content and sensory quality of peaches at 4 ℃, the article discussed the preservation effect of active film. The results showed that the film added with GEO improved the CO2/O2 transmission rates significantly, delayed the decline of firmness and total soluble solids content,inhibited the increase in pH value and MDA content. Therefore, the film maintainedthe sensory quality of peaches, and prolonged the preservation period from 15 days to 30 days. Adding GEO improvesthe gas permeability of the film, and hada goodpreservation effect on peaches. It maintainsthe physiological feature and sensory quality of peaches, and extends theirstorage period.