Abstract: The numerical simulation of vertically stiffened steel plate shear wails (SPSWs) with two-side connections was performed with ANSYS software. A comparison was made between the theoretic initial stiffness of un-stiffened SPSWs with two-side connections and the initial stiffness of vertically stiffened SPSWs with two-side connections cal-culated by the finite element method. The effects of stiffeners and axial compression ratio on SPSWs were studied elementarily. Under shear force, the mechanism and destroying order of members in two-side connected SPSWs with boundary frame members were studied. Push-over analysis was made both in vertically stiffened SPSWs with two-side connections and with four-side connections, whose boundary frame members were designed to be the same. Some seismic performances of these two kinds of SPSWs were compared.