In order to promote the application of Tailor Rolled Blank (TRB) in the structural parts for auto beams, the bending springback characteristics of TRB in the longitudinal bending process were studied by taking Uchannel as a research object. Firstly, the numerical simulations on the longitudinal bending process of TRB Uchannel were performed. The bending springback trend of TRB was analyzed, and the stress distribution of TRB was discussed. The bending springback law of TRB was revealed, and the influencing factors of TRB equivalent stress were discussed. Moreover, the springback simulation results were verified by the corresponding experiments. The research findings showed that a nonuniform stress distribution was the fundamental reason why there was an uneven bending springback distribution in the direction of the bending axis during the longitudinal bending process of TRB Uchannel. Annealing can diminish the stress difference of TRB before and after unloading, thus restricting the TRB bending springback. All of the blank size, the blank thickness and the thickness transition zone (TTZ) length of TRB will greatly affect the equivalent stress of TRB, and then change the bending springback value and distribution. Besides, the bending springback of different zones with varying thicknesses in a TRB part interact was mutually restrained, which made the TRB springback tend consistent, resulting in the TRB bending springback lay between the springback of the thinner and thicker plates.