ABSTRACT:The objective of this paper is to study Dufour, Soret and thermal conductivity on unsteady heat and mass transfer of magneto hydrodynamic (MHD) oscillatory flow of Jeffery fluid through a porous medium in a channel. The partial differential equations governing the flow have been solved numerically using semi-implicit finite-difference scheme with the aid of MATLAB software. The results obtained are displayed graphically and in tabular form to illustrate the effect of various parameters on the dimensionless velocity, temperature and concentration profiles, to show the effects of different parameters entering in the problem. Results from these study shows that velocity and temperature increases with the increase of Soret and Dufour why the thermal conductivity increases as temperature profile increasing. Also, it is observed that soret number increases as concentration profile decreases. © JASEM http://dx.doi.org/10.4314/jasem.v19i4.32 KEY WORDS: Heat and Mass Transfer, Dufour, Soret, Jeffery Fluid and Thermal Conductivity INTRODUCTIONThe Jeffery fluid flow with heat and mass transfer problem have many practical applications in sciences and technology. It is used in agricultural engineering to study the underground water resources, seepage of water in river-beds, food processing, magneto hydrodynamics (MHD) generators, geothermal energy extraction, electromagnetic propulsion, polymer solution and the boundary layer control in the field of aerodynamics and so on. The combined heat and mass transfer has many applications in difference branches of science and technology. The influence of heat transfer on MHD oscillatory flow of Jeffery fluid in a channel has been done by Kavita et .al. (2013). The problem was solved analytically using perturbation technique and the solution obtained shows that a rise in the chemical reaction parameter leads to reduction of the velocity as well as species concentration.