Present study concerns with the numerical investigation of the MHD free convection and heat transfer flow through a semi-infinite vertical porous plate with the effects of chemical reaction. A boundary layer approximation is premeditated to develop a flow model representing time dependent momentum, energy and concentration equations. The governing model equations are governed as a form of coupled nonlinear dimensionless system of partial differential equations by the as usual mathematical procedure of transformation and which are solved by using explicit finite difference method. Then the numerical results have been calculated by Compaq Visual Fortran 6.6a and the obtained results have been capitalized for the various dimensionless parameters on velocity, temperature and concentration profiles along with the skin friction coefficient, Nusselt number and Sherwood number. At the end, the obtained results are plotted and discussed after stability test by using graphics software tecplot-9. An increases in the Grashof number is to increase the velocity distribution but by increasing the magnetic parameter which reduces the velocity profile whereas increasing the heat generation parameter which increase the temperature profile.