  Let $\mathcal{M}$ be a $\sigma$-finite von Neumann algebra, equipped with a
  normal faithful state $\varphi$, and let $\mathcal{A}$ be maximal subdiagonal
algebra of $\mathcal{M}$.
  We prove Stein-Weiss type interpolation theorem of Haagerup noncommutative
$H^{p}$-spaces associated with $\A$.
