Abstract: To investigate the seismic performance of SCFST (stone prism encased concrete-filled steel tube composite columns), the pseudo-static tests were carried out on 7 SCFST columns and 2 CFST (concrete-filled steel tube) columns. With the steel ratio, axial compression ratio, stone ratio, and configuration of the stone prism as test parameters, the whole loading process of the specimens was observed, and the failure mode, seismic performance indexes such as hysteretic curve, skeleton curve, ductility, strength degradation, stiffness degradation, and energy dissipation capacity were studied. The test results show that the final failure mode of SCFST columns under reversed loads is similar to that of CFST columns, mainly manifested as circular buckling failure at the bottom of the steel tube. The hysteretic curves of specimens showed a full fusiform shape without obvious pinching phenomenon. The load-carrying capacity of SCFST columns is 28.16% higher than that of CFST columns, and the ductility coefficient of all specimens is greater than 3.6. The horizontal load-carrying capacity and deformation capacity of the specimens increase with the steel ratio α, while they both can be improved by increasing the steel ratio α and stone ratio β within a certain range.