We propose a scheme to enhance near-UV band absorption of a rutile ${\mathrm{TiO}}_2$ nanoparticle by placing Au nanoparticles in its neighborhood. The discrete-dipole approximation method was employed to calculate the absorption spectrum of pure rutile ${\mathrm{TiO}}_2$ and that of ${\mathrm{TiO}}_2$ mixed with Au nanoparticles. The results indicate that pure rutile ${\mathrm{TiO}}_2$ has its maximum absorption located in the deep-UV band. With the existence of Au nanoparticles, a significant light harvesting effect occurs, and this maximum shifts to the near-UV band, where usual excitation wavelength falls.