With the introduction of social capital to participate in the construction of many lines, Tianjin's rail transit construction has entered a period of comprehensive acceleration.At present, the several lines under construction are all radial lines that pass through the central area of the city, and the passage of urban traffic arteries along the line causes the capacity of road sections and intersections to decrease.Therefore, it is necessary to in-depth study the concrete manifestations of the impact of subway construction on urban road traffic, analyze the impact of different construction methods and different decompression methods on motor vehicles, non-motor vehicles, pedestrians, and the surrounding environment.Combining on-site investigation and simulation, scientifically evaluate the traffic organization plan, discover deficiencies in time and optimize traffic organization based on ground, and better solve the urban road traffic problems caused by subway construction.