Abstract: To reveal the influence of pore connectivity topology on the compression energy absorption performance of regular porous structures, this study establishes two types of regular porous structure models, A and B, with different pore connectivity topologies under controlled conditions of cell pore diameter, arrangement, and relative density. Quasi-static compression finite element simulations using the LS-DYNA explicit dynamics method are conducted for A and B. The results show that the A-type structure is dominated by local skeleton bending and buckling, while the B-stype structure forms a more continuous load transfer path. At ρ_r=0.238 and ε=0.4, the average Mises equivalent stress of the representative region of B-type is about 26.7% higher than that of A-type, but the stress variation coefficient is also higher. Plastic strain statistics show that the B-type structure has higher plastic participation in the early stage of compression and exhibits a higher average cumulative plastic strain under the same nominal strain. At the same relative density, the plateau stress of the B-type structure is about 101.8%-131.1% higher than that of A-type, and the specific energy absorption is also significantly increased; the specific energy absorption of the B0238 model can exceed that of the A0343 model, optimizing the pore connectivity topology can achieve equivalent or better energy absorption effects at a relative density reduction of about 30.6%, providing a reference for the design of lightweight porous energy absorption structures.