  In this paper, we examine the interacting dark energy model in $f(T)$
cosmology. We assume dark energy as a perfect fluid and choose a specific
cosmologically viable form $f(T)= \beta\sqrt{T} $. We show that there is one
attractor solution to the dynamical equation of $f(T)$ Friedmann equations.
Further we investigate the stability in phase space for a general $f(T)$ model
with two interacting fluids. By studying the local stability near the critical
points, we show that the critical points lie on the sheet $u^*=(c-1)v^*$ in the
phase space, spanned by coordinates $(u,v,\Omega,T)$. From this critical sheet,
we conclude that the coupling between the dark energy and matter $c\in (-2,0)$.
