Abstract: Tubular cross section links (TCSLs) exhibit high deformation capacity and strong out-of-plane stability, offering unique advantages and significant applicability in seismic design. With low-yield-point (LYP) steel, these TCSLs demonstrate enhanced energy dissipation, further augmenting their seismic performance. This study, through experiments, simulations and theoretical analysis, investigates the cyclic loading performance of TCSLs and offers engineering design recommendations. Twelve full-scale specimens were designed and tested with five parameters, including link length, to assess load capacity, deformation capacity and overstrength. The failure modes were analyzed to reveal the internal force mechanisms. The comparisons of mechanical properties established the effects of geometric parameters. Subsequently, the finite element models of TCSLs was developed to accurately simulate the yielding, failure and overstrength behaviors under cyclic shear loading, effectively quantifying energy dissipation. Finally, the relationships between design parameters such as link length ratio and factors like yield capacity and overstrength factor were determined with numerical simulation. A key finding is the transition of the flanges' role from providing out-of-plane restraint to active energy dissipation as the web experiences failure.