The evolution of microstructure, textures, and mechanical properties of thin-walled copper tube during heat treatment was investigated using EBSD technique and tensile test. The results show that the initial deformation textures of pre-drawn thin-walled copper tube are mainly composed of Copper and Y components, while with the increase of temperatures, the textures are transformed into a strong Goss texture gradually. The high-resolution microstructural characterizations indicate that the new Goss recrystallized grains nucleate and grow up within the deformed Copper grains and Y grains in different mechanisms, respectively. The tensile strength of the thin-walled copper tube decreases gradually with the increase of the temperature, while the elongation increases first and then decreases sharply due to the action of grain sizes and texture components.