Based on the doctoral dissertation with a large volume of literature, this book introduces the special property, application, preparation method, modifying method and post-modifying properties of Tio2 Nanotube Arrays, by means of which to realize the preparation of Tio2 Nanotube Arrays and modification of narrow-band semiconductor. In the course of preparation, the relationship between anodizing current density and Tio2 Nanotube Arrays in terms of shape is tracked. During the modification of Tio2 Nanotube Arrays by narrow-band semiconductor, theoretical basis of controlled Deposition, Modification and performance optimization of Tio2 is provided through relevant parameters of modification. In the process of loading precious metal, proof on modification of loading precious metal is found by accessing the performances of Tio2 Nanotube Arrays after and before loading.