This work deals with the study of thermal radiation and MHD on mixed convection flow of a viscous incompressible electrically conducting fluid through a porous medium with variable permeability in the presence of oscillatory suction. The influence of a first-order homogeneous chemical reaction, heat source and Soret effects are analyzed. The resultant governing boundary layer equations are highly nonlinear and coupled form of partial differential equations which are solved analytically using two-term harmonic and non-harmonic functions. The effects of different physical parameters on the velocity, temperature and concentration fields as well as skin-friction coefficient, Nusselt number and the Sherwood number with their amplitude and phase are discussed in detail. The results are presented graphically anddiscussed qualitatively.