  Let $h(G)$ denote the largest $t$ such that $G$ contains $K_t$ as a minor and
$\chi(G)$ be the chromatic number of $G$ respectively. In 1943, Hadwiger
conjectured that $h(G) \geq \chi(G)$ for any graph $G$. In this paper, we prove
that Hadwiger's conjecture holds for $H$-free graphs with independence number
two, where $H$ is one of some specified graphs.
