The factors that affect the chestnut kernel browning including tannin , moisture content ,PPO, POD, processing method and sterilization were studied in this article. Comparing the tannin content of different chestnut kernel parts and processing methods showed that higher tannin content led to deeper browning; Meanwhile three tannin extraction methods were compared and acetone-water (6:4) had the best effect. The tannin -reduction experiment proved that tannin did take part in the chestnut kernel...