In this experiment,artificially wounded yam tubers were treated at 5℃,15℃,25℃ and 35℃ for 7 days,respectively.The effects of different temperature treatments on the postharvest tissue structure,weight loss and disease resistance,disease resistance indicators related with metabolism of active oxygen and phenolic substance were studied.The results showed that in the range of 535℃,the corrugated polyphenols and lignin were accumulated in the wound section with the increase of treatment temperature.The treatment group with the high temperature of 35℃ accumulated the earliest and accumulated the most.The weight loss rate and incidence of yam tuber treated with callus at 35℃ were significantly reduced.The contents of hydrogen peroxide,total phenols and flavonoids,the production rate of superoxide anion,and activities of superoxide dismutase,peroxidase,polyphenol oxidase and phenylalanine ammonia lyase of the yam tuber under 35℃ were the highest among the treatments.It is indicated that the high temperature treatment of postharvest yam at 35℃ can improve the metabolism of active oxygen and phenolic of yam tubers,effectively promote the healing and disease resistance of yam tuber postharvest damage,and reduce postharvest rot.