Abstract: Based on the simulation results of Deform-3D finite element software, the 20 carbon steel was first deformed by equal channel angularpressing, and then the deformed specimen was annealed at different temperatures in this study.The microstructure and tensile properties of 20 carbon steel were studied and analyzed by metallurgical microscope, scanning electron microscope and electron universal testing machine by equal channel angular pressing and subsequent annealing.The results show that due to the grain size refinement and work hardening, the strength of the extruded 20 carbon steel increases, the yield strength and tensile strength increase to 590 MPa and 683 MPa, and the elongation decreases to 8.9%.After annealing, 20 carbon steel decrease with the increase of annealing temperature, and the elongation increases with the increase of annealing temperature due to the grain growth and recrystallization.At the annealing temperature of 400 ℃,20 carbon steel has a good combination of strength and elongation, with yield strength and tensile strength of 600 MPa and 712 MPa, respectively, and an elongation of 12.5%.