Since flow through porous medium is receiving attention because of its application in various domains such as Petroleum, Geology, Chemical and Nuclear Engineering etc. It is either buoyancy flow or free and forced Convection past bodies in different shapes embedded in a porous mediumThe study is concerned for transient free convective flow of an incompressible viscous fluid flow between parallel plate through porous medium. The unsteady transient free convection flow of an incompressible dissipative viscous fluid in between parallel plates at a distanced three is porous medium. Due to presence of heat flux under the influence of uniform transverse magnetic field. The velocity distribution the temperature distribution, coefficient of skin friction & rate of heat transfer has been investigated.