By analyzing conditions that urban rail vehicles in the traction power supply network occur the regenerative braking or resistor braking in electric braking process, and depending on the grouping of vehicles, lines, load, run strategy, operation plans, traction power supply and other basic conditions, based on single vehicle computing model and multi-vehicles power supply network model, electric braking energy distribution model were established and simulation were carried out. Simulation results showed that in the same line and vehicle conditions, the ratio of regenerative braking energy occupying the total braking was 80.1% when vehicle interval was 180 seconds, with the interval increases the ratio decrease. When the interval was 900 seconds the electric braking energy was almost consumed by braking resistor. The braking energy distribution model can provide theoretical support for a variety of urban rail transit braking energy recovery methods, but also offer foundation for selection of braking energy recovery device.