The purpose of this paper is to focus on the heat transfer characteristics of thermally developed electrokinetic flow of the nanofluid (water-Al2O3) through a porous microtube in the presence of the imposed magnetic field. The wall of the microtube is subjected to the constant heat fluxes. Moreover, the local thermal equilibrium (LTE) model is considered. Combining with the electrokinetic effects of the wall, and utilizing the Brinkman model for the nanofluid flow in the porous medium, the conservative partial differential equations have been transformed into the ordinary equations. The analytical solution of velocity and numerical solution of temperature are derived based on relevant dimensionless parameters. Furthermore, the Nusselt number, local and total entropy generation analyses are further examined qualitatively. (C) 2018 Elsevier Ltd. All rights reserved.