Abstract: The Cu²⁺ doped TiO₂ composite photocatalysts were synthesized by using the layered H₂TiO₃ as the processor and Cu(NO₃)₂ as the copper source after the colloidal solution was adjusted a desired pH value. The photocatalysts obtained were characterized by XRD and SEM. And a methylene blue (MB) was used to study the photocatalytic activities of Cu²⁺ doped TiO₂ composite photocatalysts under UV light irradiation. The results show that the layered H₂TiO₃ is completely transformed into Cu²⁺ doped rutile/anatase TiO₂ composites at pH 0.5~1.5. And the Cu²⁺ doped TiO₂ composite obtained at pH 0.5 exhibits the higher photocatalytic activity.