The current situation of road traffic congestion in the central urban area of Hohhot is analyzed by using the traffic big data. The main reasons for road traffic congestion in the central urban area of Hohhot are summarized. The improvement countermeasures are proposed from the aspects of giving priority to the development of public transportation, improving the road network construction and strengthening the static traffic management in order to provide the reference for the improvement of traffic congestion in similar large cities.