In order to improve the payload and the reliability of new generation launch vehicles, the rocket tank has higher requirements for material properties and matching forming processes. For the typical specification 2219 aluminum alloy sheet with the thickness of 6 mm used in the rocket tank, the influence curves of heat treatment state on the basic mechanical properties were established by studying on the basic mechanical properties under different rolling directions and heat treatment conditions, and the elastoplastic parameters of 2219 aluminum alloy under different heat treatment conditions were characterized. The results show that the rolling directions have different effects on the mechanical properties of 2219 aluminum alloy under different heat treatment conditions, and the strength parallel to the rolling direction in the annealed state is higher. However, after holding for 30 min at solution temperature of 535 ℃, the performance perpendicular to the rolling direction in the quenched state is higher. Furthermore, the uniform plastic deformation capacity of quenched sheet is improved, and the tensile strength and strain hardening exponent reach more than two times of the annealed state. At the same time, the yield strength, elongation and anisotropy coefficient are slightly improved compared with the annealed sheet, and the window of forming process is optimized to achieve forming in the quenched state and effectively avoid the deformation of heat treatment.