Value of time plays a significant role in the evaluation of investment effectiveness of transportation plans. Therefore, it is a prerequisite to accurately estimate value of time savings to meaningfully evaluate transportation policies. In this study, the focus is on weekday activities and associated travel behaviors. The evaluation of individualsí time allocation behavior on weekdays and an activity choice model has been investigated in this study for analyzing the preference of individualsí time allocation. The activity choice model specifically takes into account the state of the individual time allotment on weekdays and subjective evaluation of time use on weekdays. There results show that : 1) The socioeconomic conditions have strong effects on workersí time allocation. 2) The priority of activity time allocation would affect time allocation of workers significantly. 3) Furthermore, priority of different activities will produce different marginal utility. Therefore, the priority of activity should be considered before establishment of a model of activity time value in the future.