The rectangle core plate of all-steel buckling-restrained braces （BRBs） usually exhibit obvious local buckling， due to the lack of longitudinal restraint from the encasing tube. To eliminate the undesirable effects， a novel steel BRB is proposed. In this new-type steel BRB， two T-shaped steels are adopted as the minor restraint elements to restrain the core plate instead of the infilled concrete or mortar. In order to reproduce the behavior of the BRB， the finite element model is established using Abaqus software， and validation of the model is done through comparing the experimental results with the simulated results. The comparison results demonstrate that the finite element model could be used for the further parameter study on the all-steel BRBs. Finally， the parameter study of factors， including the initial defects， the friction coefficient and the gap between the steel core and the outer sleeve， the width-to-thickness ratio of the steel core and the thickness of the outer angle steel， shows that the well-configured all-steel buckling restrained braces could have many advantages and exhibit desirable seismic performance.