To quantitatively study the operating efficiency of right-turning vehicles at signalized intersection,a travel time model was established on the basis of gap theory and queue theory,which was under the assumption that the straight flow of non-motor headway followed the combined negative exponential distribution and right-turning flow headway followed the negative exponential distribution.Comparison was done by field observation data,and the reasons of the results were analyzed and the applicability of the model was set up.Three significant factors can exert apparent effects on travel time,involving right-turning flow rate,following car headway and critical gap.The travel time model of right-turning vehicles at intersection established in this paper is efficient,practical and with strong applicability.