In this paper, an analysis is made on the unsteady flow of an incompressible electrically conducting viscous fluid bounded by an infinite porous flat plate. The plate executes harmonic oscillations at a frequency $n$ in its own plane. A uniform magnetic field $H_0$ is imposed perpendicular to the
direction of the flow. It is found that the solution also exists for blowing at the plate. The temperature distribution is also obtained by taking viscous and Joule dissipation into account. The mean wall temperature $\theta_0(0)$ decreases with the increase in the Hall parameter $m$. It is found that no temperature distribution exists for the blowing at the plate.