A traveling track based traffic survey approach and its data processing method under urban road network is proposed. Taking plate number as the only identity, complete travel tracks of vehicles are obtained through statistical analysis of plate number from the whole network, thus amount of detailed and useful travel information of vehicles and rich, authentic and reliable of traffic status information of network can be generated. To ensure the whole process of traveling track survey controllable, manageable,queryable and visible, a traveling track survey analysis system is arcitected based on ArcGIS platform. Finally, an example of traffic survey for Xi'an QuJiang new district has shown the efficiency, accuracy and scientificity of the methodology and analysis system of travelling track survey approach.