Concrete filled steel tubular（CFST）frame with buckling-restrained brace（BRB）is a new type of CFST energy dissipation structure.The effects of linear stiffness ratio of beam to column

initial stiffness of BRB and axial compression ratio of CFST columns on the seismic performance of structure were studied by using the finite element software Opensees.The study results show that:（1）the results of numerical simulation agree well with experimental analysis results and the correctness of the numerical model is tested and verified;（2）the CFST frame with BRB has better seismic behaviors

while linear stiffness ratio of beam to column is about 0.1-0.3;（3）the energy dissipation effectiveness of the structure is superior when K1 is between 40kN/mm and 80kN/mm;（4）the seismic performance of CFST frame and the strength degradation can be significantly improved by adding BRB in the structure when the axial compression ratio of the CFST columns that is in the reasonable value range is relatively large.