Abstract: Understanding deeply the properties of the ground and excited states of ⁷Li and ⁷Be is important for explaining the creation and related reactions of Li and Be isotopes in the primordial universe. Most of the cluster model calculations of ⁷Li or ⁷Be consider only the \alpha+\mathrmt or α+³He two-body cluster structure. The present work conducted theoretical research employing a four-body microscopic cluster model. The results show that, by considering the three- and four-body cluster structures, the calculated wave functions of ground and excited states are effectively modified. The obtained observables such as energy spectra and nuclear radii reproduce better the experimental data, compared to that in the two-body calculation.