Current examination concern with influence of radiation absorption and viscous dissipation on MHD free convective flow of Casson fluid model past a semi-infinite vertical porous plate. Multiple regular perturbation law was utilized for solving nondimensional governing equations. Computations are performed graphically to scrutinize the deportment of fluid velocity, temperature and concentration. And also skin friction, nusselt number and sherwood number are illustrated in tabular form on the vertical porous plate with the dissimilarity of emerging physical parameters. Finally, conclude that the enhancement of Eckert number leads to rise in velocity, but contrast repercussions were demonstrated in case of temperature. And also sherwood number declined with the rise in chemical reaction as well as schmidt number. However, velocity and temperature were diminishned with amplify of Casson fluid and thermal radiation parameters.