Considering the traffic flow characteristics near the on-line bus stop, a three-lane cellular automaton vehicle lane-changing model is established by optimizing car-following rules and lane-changing rules. The mod- el is based on the STCA model and emphasizes the bus priority. Using the established model, the road traffic operation of dedicated bus lane (DBL) and intermittent bus lane (IBL) is partially simulated. In light of the lane change frequency of vehicle and the departure frequency of buses, this paper makes a comparative analysis of the fundamental diagrams, time-space evolvement, average speed and speed stability, and further explores the applicable traffic conditions of IBL strategy. The results show that when the vehicle density is greater than 20 veh/km and the departure frequency of buses is less than 200 veh/h, IBL strategy is better than DBL strategy. At this time, some social vehicles are allowed to enter and leave the bus lane. Although the lane change frequency of vehicle is higher, it has no negative impact on the traffic flow of the section. Instead, it can improve the traffic efficiency and the utilization of road resources, and ease the traffic congestion.