Abstract: TU1 oxygen-free copper is widely used as the shell material of sintered heat pipes. However, after high-temperature sintering treatment, the coarse recrystallized grains and texture were formed, which severely affected the preparation and service performance of the heat pipe. Taking the TU1 copper tubes without and with La addition as the research object, the high temperature treatment at 950 ℃ was carried out, and the effect of annealing twin on the bending performance and corrosion resistance of thin-walled TU1 copper tubes was investigated. The results show that after annealing at 950 ℃ for 40 min, the texture component of the copper tube mainly includes Goss texture, and the formed Σ3 grain boundary is annealing twin boundary. After adding a trace amount of rare earth element La, the P content of the copper tube decreases, the number of annealing twins decreases, the bending strength and elongation of the copper tube increase, the bending performance is improved, while the corrosion potential of the copper tube shifts negatively, and the corrosion current increases slightly. Immersion corrosion tests in a 3.5%NaCl solution show that the corrosion form of the copper tube is mainly pitting corrosion. Although the corrosion rate increases slightly, the corrosion uniformity is significantly improved compared with that of the tube without La addition.