To study the hysteretic behavior of a new kind of high-performance steel produced by HBIS(Hebei-Iron-and-Steel), three beam-column joints with different connection forms were designed and tested under quasi-static loading conditions. The experimental results show that the “taper weakened” joint exhibits fully developed ductility and excellent energy dissipation capacity, while the “composite” joint shows significantly improved seismic performance. Based on the test results, a trilinear restoring force model considering stiffness degradation was established, with the skeleton curve fitted to key experimental feature points.The hysteretic curve expression was derived using an exponential differential equation. The reconstructed model achieved an analytic error within 10%, effectively capturing the hysteretic response of the jonts.