Abstarct: Needs for energy has been growing in recent decades and at the other hand fuel resources are limited and finite, which is why in recent years enhancing heat transfer in various engineering systems has been noticed by many researchers and several studies about this have been made. One of the most common way to improve heat transfer in heat exchangers is inserting porous media. In this study, heat transfer and pressure drop in a horizontal pipe with forced convection flow by inserting porous media, is numerically investigated in two-dimensional axisymmetric case. Flow considered is laminar and boundary condition on the wall is constant heat flux. Effect of different parameters such as permeability, thickness of porous media and thermal conductivity ratio on the rate of heat transfer and pressure drop is studied. The results shows that when the velocity at the inlet of pipe is constant for the most arrangements, inserting porous media increases the heat transfer rate and for example for the case partially filled in central arrangement, the average Nusselt number increases up to six times of the free pipe average Nusselt number. Although inserting porous media increases the heat transfer rate but also increases the pressure drop along the pipe which requires more pumping power. Thus inserting porous media is suitable from the heat transfer point of view and undesirable form the pressure drop point of view. So inserting porous media in the pipe is investigated from the heat performance point of view.