Abstract: This study analyzes the chemical reaction and heat source effects on MHD free convection flow, of an incompressible fluid that is viscous over an inclined porous surface. With the application of the perturbation technique, the solution of a set of ordinary differential equations are gotten as a result of reducing the non-linear partial differential equations of motion, energy and diffusion, which are solved analytically for velocity, temperature and the concentration distribution. The effect of Chemical reaction and heat source on the velocity, temperature, concentration, skin friction, heat transfer and rate of mass flux distribution is plotted graphically and discussed.