Abstract: To the limitation of the description for complicated and uncertain temporal knowledge,an uncertain temporal logic based on intuitionistic fuzzy sets was proposed. The model defines the determinant formula of the point temporal logic, point interval temporal logic and interval temporal logic in continuous domain and discrete domain. By adding hesifancy degree parameter, the reasoning result is more believable and precise. Finally, two kinds of the uncertain temporal knowledge were descripted and the possibility of all temporal relationship was measured by two instances, then it is indicated that the model is more predominant.

Key words: Intuitionistic fuzzy sets,Uncertain temporal logic, Interval temporallogic,Point-temporal logic