CaTi2O5 was selectively prepared by a solvothermal process without template and surfactant.The phase of the as-prepared samples was determined by X-ray diffraction(XRD).The microstructure was characterized by scanning electron microscopy(SEM)and transmission electron microscopy(TEM).Results found that pH values had a crucial effect on the crystal phase and shape evolu-tion of the samples.CaTi2O5 sample prepared at pH of 5.2 shows high efficient light harvesting,large surface area and crystallinity.Moreover,CaTi2O5 shuttle-like sample shows good photocatalytic activity against methyl orange due to its longer and thinner shuttle-like morphology and high crystallinity,enhanced light harvesting and large surface area.The photocatalytic rate of CaTi2O5 shuttle-like structure reaches 0.1988 min-1 for 25-min methyl orange degradation under the ultraviolet light irradiation and dis-plays an excellent photostability with a degradation effi-ciency of 0.1952 min-1 after four cycles.