To study the decision-making behaviors of commuters in uncertain traffic environment,based on the cumulative prospect theory,a joint decision model with departure time and travel route was constructed considering the bounded rationality of traveler.The model includes three reference points as follows:the earliest,the latest acceptable arrival time and the travel time.At the same time,the impact of travel time reliability and reference points was considered for the risk preference coefficient.According to the selected reference points,the value function and decision weight function could be calculated by the model, and the travel plan could be determined through selecting the maximum prospect value.The results of the example show that commuters with high reliability requirement stend to depart later and select less risky routes to travel,while those with low reliability requirements tend to depart earlier and select the routes with shorter travel time to travel.To some extent,the research results can provide a theoretical basis for the dynamic route guidance and the effect evaluation of travel demand management strategies.