The present paper deals with magneto hydrodynamic mixed convection heat transfer analysis over a vertical surface embedded in saturated porous medium with variable wall temperature. The effects of transverse magnetic field, radiation heat transfer and dissipation are examined. The plate temperature in excess of constant temperature of the ambient fluid is assumed to be proportional to x^l. The ratio of Rayleigh to Peclet number is taken as mixed convective parameter (Î) and the effect of Î>0 and Î<0 on the boundary layer solution is studied and presented in the graphical form. The boundary layer solutions are obtained by using similarity variables for Î>0 and Î<0. It is found that with the increase in l value and radiation parameter (F), the rate of heat transfer increases through medium. Different velocity and temperature profiles and Nusselt number variation for both buoyancy aiding flow and opposing flow are also presented.