Abstract: A series of heterogeneous Gyroid structures with axially graded porosity were designed based on conical surface equations and fabricated using selective laser melting（SLM）. Quasi-static compression tests and finite element simulations were conducted to systematically investigate the effects of porosity gradient and loading direction on the mechanical properties and energy absorption characteristics of the porous structures. The results indicate that Gyroid axial gradient porous structures exhibit anisotropic mechanical behavior. When loaded perpendicular to the gradient direction, the structures demonstrated a strengthening effect, attributed to stress concentration in low-porosity regions. In contrast, loading parallel to the gradient direction led to strength degradation, resulting from progressive collapse initiated in high-porosity regions. The extent of strengthening or weakening was positively correlated with the gradient range. The energy absorption efficiency of Gyroid axial gradient porous structures was generally lower than that of their homogeneous counterparts, primarily due to incompatible deformation at porosity gradient interfaces, which impeded stress transfer. The structure with a 70%-30% porosity gradient loaded perpendicular to the gradient direction exhibited the best overall mechanical and energy absorption performance, with a yield strength of 92.1 MPa and a plateau stress of 163.1 MPa, representing increases of 15.86% and 10.42%, respectively, compared to the homogeneous structure. Its maximum energy absorption reached（63.06±0.53） MJ/m~3, comparable to that of the homogeneous structure（63.97 MJ/m~3）.