Copper and its alloys are most widely used alloys beyond steel and aluminum alloys. They have excellent thermal and electrical conductivity, suitable strength-to-weight ratio, good ductility, and resistance to corrosion in the aquatic environments. The mechanical properties of this alloy can be improved by severe plastic deformation such as high shear strain. As a result of grain refinement, mechanical properties such as hardness, strength, toughness, and ductility are increased. In the current study, an equal channel angular extrusion (ECAE) process as a method of severe plastic deformation, was used to improve the mechanical properties of 60-40 two phase brass alloy. For this purpose, after casting and forging, the samples were entered at 350 °C and 180° rotation angles in a die and their mechanical properties and microstructure were investigated for each pass. Optical microscopy images of the microstructure revealed formation of recrystallized grains in the first pass and their development by increasing the number of passes. The development of these grains improved strength and ductility in a way that the elongation increased up to 85 percent at room temperature after sixth passes. Also, the results showed that microhardness in the final pass increased about 100 percent. In order to study the behavior of the alloy during the initial pass more accurately, samples were rolled to 95 percent and then were annealed at 350 °C. Microstructure images of the annealed samples after rolling confirmed simultaneous occurrence of dynamic and static recrystallization in the initial passes. Scanning electron microscopy was also used to investigate the fracture behavior of the samples. It showed that ductile fracture was occurred in all samples after increasing the number of passes. keywords: 60-40 Brass alloy, Severe plastic deformation, equal channel angular extrusion, Hardness, Elongation, Recrystallization