Abstract: In order to improve the plasticity of double-reduced tin plate,this paper studied the influence of α phase recrystallization annealing and α+γ phase intercritical annealing on the microstructure and mechanical properties of double-reduced tin plate, In this paper,the microstructures of the steel were detected by OM、SEM and TEM, the rockwell hardness and mechanical propertie of the material were tested respectively by rockwell hardness tester and tensile tester. The result showed that with the α phase recrystallization annealing process, the experimental steel′s microstructure were ferrite and cementite,the grain size of ferrite varied greatly and coarse cementite discretely distributed in ferrite grains and grain boundaries. With the α+γ phase intercritical annealing process, the experimental steel′s microstructure were ferrite and pearlite,the ferritic grains were equiaxed and distributed in uniform size,the pearlite island distributed in the ferrite grain boundary and the lamellar space of the pearlite reached about 150 nm.The rockwell hardness HR_30T of double-reduced tin plate with those two different annealing processes were both controlled between (73±4)HR30T.Compared with the double-reduced tin plate processed with α phase recrystallization annealing,the rockwell hardness of double-reduced tin plate processed with α+γ phase intercritical annealing increased by about 1.5 units,the yield strength R_p0.2 increased by about 25 MPa, the tensile strength R_m increased by about 30 MPa, and the elongation A₅₀ increased by about 4.0%.With the α+γ phase intercritical annealing process, the coarse cementite residued from the cold rolling redissolved sufficiently and thus formed equiaxed ferrite grains distributed in uniform size and pearlite with fine layer space during the subsequently cooling process after soaking heat, which led to the significant improvement of the material′s strength and plasticity.