  In this paper we study the magneto-micropolar fluid equations in $\R^3$,
prove the existence of the strong solution with initial data in $H^s(\R^3)$ for
$s> {3/2}$, and set up its blow-up criterion. The tool we mainly use is
Littlewood-Paley decomposition, by which we obtain a Beale-Kato-Majda type
blow-up criterion for smooth solution $(u,\omega,b)$ which relies on the
vorticity of velocity $\nabla\times u$ only.
