A square concrete-filled steel tube frame column with end ribs was put forward. The end longitudinal rib was used to avoid the premature local buckling of steel tube wall and then to improve the load carrying capacity, ductility and seismic performance of concrete-filled steel tube. Refined nonlinear finite element (FE) models were established by using MSC.Marc to study the existing experiments, and the results from the FE models fit well with the test data. Based on the reasonability of the FE models, parametric analyses were carried out to further explore the behavior of the square concrete-filled steel tube frame column with end ribs. The analyses have shown that the end ribs can delay the local buckling of the steel tube and improve the load carrying capacity, ductility and seismic performance. The length of the end ribs are to be set at 1~2 times the sectional side length from the column end, and the height and thickness of the end ribs should satisfy certain structural requirements. The increase of the thickness of the end ribs or the number of end ribs on each side can improve the load carrying of the column, and the latter is better.