In this paper, the microstructure and high-temperature properties of TC4 titanium alloy in different states were studied by different heat treatments, and the microstructure and high-temperature properties of TC4 titanium alloy in different states were studied by room temperature and high temperature tensile experiments, with the help of XRD and SEM. The results showed that the α content of titanium ingots composed of irregular oval and short rod-shaped primary α phases and a small number of β phases was significantly reduced after high temperature forging, and a uniform equiaxed structure was formed, and a strip-like α′ phase appeared. After annealing, the content of the equiaxed α phase decreased, and a two-state microstructure was formed. The tensile strength is increased by 33MPa and the elongation is increased by 4% at room temperature, and the tensile strength is increased by 22MPa and the elongation is increased by 2% at high temperature. After solution treatment, the equiaxed α phase distribution was more uniform, and the needle α′ phase was significantly increased. The tensile strength at room temperature increased by 104MPa and the elongation decreased by 4%, and the tensile strength increased by 87MPa and the elongation decreased by 2% at high temperature. After solution aging treatment, the thin strip-like secondary α phase merged and grew to form a sheet-like structure, and the content of β phase was significantly reduced. The tensile strength at room temperature is increased by 114MPa, the elongation is reduced by 4%, and the tensile strength is increased to 56MPa at high temperature, the elongation is reduced by 2%, and the fracture mode is ductile fracture.