We extend the chiral hadronic model (FST) with an inclusion of Λ hyperon to investigate the propertiks of multi-Λ hypeuclei. With such an effective hadronic model in the relativistic mean-field approximation, we accomplish the calculations with both the conventional strong Λ-Λ interaction and the weak Λ-Λ interaction determined from recent experiment. Our calculations indicate that not only the strong but also the weak Λ-Λ interaction provide tighter binding for multi-Λ hypeuclei than the ones with only nucleons. However the strong interaction generates a binding slightly tighter than the weak interaction.