Abstract: Grass carp was used as experimental materials.Polyphonel extracts of apple branch with 79% were used to study the changing of fresh degree indexes ( TVB- N examination, pH measurement, TBA measurement, total bacteria counts) of fresh fish cubes during storage. These results indicated that polyphenol extracts of apple branch with 0.1% can help control the increasing of pH and TVB- N value as well as reduce total bacteria counts and Malondialdehyde ( MDA) content more efficient than potassium sorbate with the same concentration. Thus polyphenol extracts of apple branch were an effective and potential nutrition preservative.