Abstract: In order to explore the preservation effect of rosin-based antistaling agent on postharvest citrus fruits, maleic rosin pentaerythritol ester(MRPE) was used as main component to prepare preservative, which was coated on ponkan for preservation and compared with uncoated ponkan and ponkan coated by morpholine fatty acid salt(MFAS) at room temperature storage conditions.Relevant indexes were measured every 6 days, and the results showed that after storing for 42 days, the weight loss rate of ponkan coated by MRPE coatings was 11.39%, which was 31.39% lower than that of the blank control group; firmness of ponkan coated by MRPE coatings was 1.61 N and the changes of firmness were lower than those coated by MFAS and the blank control; meanwhile, MRPE and MFAS coatings all could effectively inhibited the changes of soluble solids content and titratable acid content and the increase of malondialdehyde content(MDA). At the same time, the activities of superoxide dismutase(SOD), peroxidase(POD) and catalase(CAT) of ponkan coated by MRPE were increased which were 9.90, 1.26 and 1.02 U/g after storing for 42 days. These results showed that the preservation effect of MRPE coating treatment was better than that of MFAS treatment, which indicated that rosin resin had a good application prospect in postharvest preservation of ponkan.