[Objective] To discuss the changes of phenolics content and related enzymatic activities in Fritillaria thunbergii Miq.bulbs and their relationship with dormancy release.[Method] F.thunbergii bulbs were stored at 4 and 10 ℃ for 75 d,respectively.Sampling was conducted regularly and the phenolics content,PPO activity and PAL activity in bulbs were detected.At the same time,phenolics content,PPO activity and PAL activity in germinated and dormant bulbs were compared.[Result] During low temperature treatment,phenolics contents in bulbs and buds both showed downward trend.Treatment at 10 ℃ for 30-45 d and treatment at 4 ℃ for 45-60 d were the two key periods for phenolics reduction and dormancy release.There was significant negative correlation between phenolics content and PPO activity in F.thunbergii.Phenolics content in terminal buds had significant positive correlation with PAL activity;and phenolics content in scales showed no had significant correlation with PAL activity.[Conclusion]Phenolics content in F.thunbergii bulbs had certain correlation with its dormancy;reduction of phenolics content was one of the physiological mechanisms for dormancy release of F.thunbergii bulbs by low temperature treatment. [Objective] To discuss the changes of phenolics content and related enzymatic activities in Fritillaria thunbergii Miq. Bulbs and their relationship with dormancy release. [Method] F.thunbergii bulbs were stored at 4 and 10 ° C for 75 d, respectively. regularly and the phenolics content, PPO activity and PAL activity in bulbs were detected. At the same time, phenolics content, PPO activity and PAL activity in germinated and dormant bulbs were compared. [Result] During low temperature treatment, phenolics contents in bulbs and buds both showed downward trend. Treatment at 10 ° C for 30-45 d and treatment at 4 ° C for 45-60 d were the two key periods for phenolics reduction and dormancy release. There was a significant negative correlation between phenolics content and PPO activity in F . Thunbergii. Phenolics content in terminal buds had significant positive correlation with PAL activity; and phenolics content in scales showed no significant correlation with PAL activity. [Concl usion] Phenolics content in F. thunbergii bulbs had certain correlation with its dormancy; reduction of phenolics content was one of the physiological mechanisms for dormancy release of F. thunbergii bulbs by low temperature treatment.