In order to reduce the damage level of traditional reinforced concrete frame structure beam-column joints caused by strong motion， and to improve the repair ability of beam-column joints after earthquakes， a new type of self-centering beam-column joint with superelastic shape memory alloy（SMA） bars is designed. Four 1/5-scale beam-column joints are designed and manufactured based on the consideration of different structure reinforcement forms and different reinforcement ratio of SMA bars， and quasi-static tests are carried out. The whole displacement and strain value of each joint plastic hinge area under low-frequency cyclic loading are measured in real time， and the corresponding vertical displacement and principal strain cloud graphs in whole process are obtained by video image correlate-3d（VIC-3D） technology. The stages of cracks initiation， cracks development and self-centering are studied， and the failure process， energy dissipation capacity， displacement ductility， stiffness degradation and self-centering performance of the joints are also analyzed. The experimental results show that the built-in superelastic SMA bars can effectively improve the energy dissipation capacity and self-centering capability of the joint， delay the cracking of concrete in plastic core area， optimize the degree of damage after cracking， and improve the economic repair-ability of joints； Within a certain range， Increasing the reinforcement ratio of SMA bars can delay the stiffness degradation of joints， but it does not significantly affect the improvement of ultimate bearing capacity and self-centering performance.