Abstract: This article focuses on Nb-doped TiO₂ as the research object, aiming to obtain highly crystalline and optoelectronic TiO₂. By using Ultrasonic Spray Pyrolysis（USP） method, Nb-doped TiO₂ were successfully prepared at atmospheric pressure. The influence of TiO₂ crystallinity, spectral absorption properties, and photoluminescence intensity was studied to explore possible ways of improving the performance of doped TiO₂. The experimental results show that niobium-doped titanium dioxide films exhibit a preferred orientation on the（101） crystal plane, and the best crystalline performance is achieved when the doping concentration reaches 5%. With increasing doping concentration, the optical transmittance of the samples shows an initial increase followed by a decrease, reaching optimal optical performance at a doping concentration of 5%, the overall performance of photoluminescence intensity is good, but as the doping concentration increases, there is a downward trend in general. The doping concentration has a significant impact on the performance of the titanium dioxide film, with all properties exhibiting good performance when the Nb doping concentration is 5%.