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In this article, we prove that if $\mathcal{D}$ is a $2$-design with $k=7$admitting flag-transitive almost simple automorphism group with socle analternating group, then $\mathcal{D}$ is $PG_{2}(3,2)$ with parameter set$(15,7,3)$ and $G=A_7$, or $\mathcal{D}$ is the $2$-design with parameter set$(55, 7, 1680)$ and $G=A_{11}$ or $S_{11}$.

Alternating groups as flag-transitive automorphism groups of 2-designs with block size seven