Abstract: The traditional fuzzy DLs lacks expressive power in imprecision knowledge which is changing by time.Aimed at this problem,the paper proposes a logic of temporal fuzzy DLs based on temporal interval relationship combining with fuzzy computing,named TFDL(IntervalAllen).It introduces Allen interval relationship to represent the temporal interval and defines its syntax and semantics.The system formed by TFDL(IntervalAllen) enhances expressive power in representing the temporal relationship of fuzzy knowledge.