It is investigated that the growth process of TiO2 nanocrystalline under the hydrothermal condition with the presence of malonic acid,butyl alcohol or ethylenediamine.The XRD results show that the products are anatase and the images of TEM and HRTEM show that the construction feather of TiO2 nanoparticles is different at the different stage.Furthermore,three nanoparticle growth models,such as Orientation attachment(OA),Frenkel shrinking(SH)and Ostwald ripening(OR),were employed to fit nanoparticle growth da...