  This paper is devoted to the incompressible Magenetohydrodynamic equations in
$\R^3$. We prove that if the difference between the magnetic field and the
velocity is small initially then it will remain forever, thus results in global
strong solution without smallness restriction on the size of initial velocity
or magnetic field. In other words, magnetic field can indeed regularize the
Navier-Stokes equations, due to cancelation.
