n this research, the fabrication and characterization of Al1050-MgAZ31B bimetal macrocomposite by extrusion method was successfully performed and the effect of independent parameters such as the temperature of the extrusion process, the storage time at this temperature and roughness of the surface on the mechanical properties and the thickness of the interfacial parts of the two-part pieces were examined. Also, heat transfer along the interface layer, the distribution of main stresses along the interfacial area of ??the layer was modeled using Abaqus simulation software. Microstructural studies showed that increasing surface roughness and the temperature of the extrusion process increased the thickness of the transited region of the joint so that at 300 ° C the bonded area between the layers was not formed and the layers did not have a good adhesion. A clear transition region was observed at a thickness of 10 macrometres at 350 ° C and 14 ?m at 400 ° C, along a common area. The results of Taguchi's analysis on the data showed that increasing the process temperature and surface roughness increased flexibility, tensile strength and yield stress, but the effect of roughness on improving mechanical properties was not as effective as the temperature effect. The extrusion process for the production of aluminum-magnesium bimetallic macrocomposites increased the tensile strength by 162% compared to aluminum and increased the elasticity of magnesium by 43% and increased the strength of aluminum, which increased much more than the predicted value It was using mixed law. Based on the simulation results, it seems that increasing the process temperature and roughness of the surfaces cause the creation of large thermal and mechanical local stresses along the joint area and, finally, the failure of the aluminum oxide and magnesium oxide layer during the process. Also, increasing the process temperature by 400 degrees Celsius reduced the shear strength, which indicates the dual effect of temperature on the mechanical properties of the composite. The results of Taguchi's analysis showed that optimum conditions for the production of aluminum-magnesium macrocomposite by extrusion, temperature of 400 ° C, 120 min and roughness created by surface grinding were observed.