  Let $G=(V, E)$ be a simple graph with vertex set $V$ and edge set $E$. The
Sombor index of the graph $G$ is a degree-based topological index, defined as
$$SO(G)=\sum_{uv \in E}\sqrt{d(u)^2+d(v)^2},$$ in which $d(x)$ is the degree of
the vertex $x \in V$ for $x=u, v$. In this paper, we characterize the extremal
trees with a given degree sequence that maximizes the Sombor index.
