Based on the experimental conditions of the Shenguang-100 kJ laser facility, the feasibility and applicability of the deep ultraviolet quintuple-frequency Thomson scattering diagnostics are evaluated, and compared with the widely used quadruple-frequency Thomson scattering, so as to provide a reference for the technical route for high-precision diagnosis of inertial confinement fusion plasmas. The probe beam signal, the drive-beam background, and the bremsstrahlung background are evaluated, and the measurement bands of the Thomson scattering ion spectrum and electron spectrum are discussed respectively. The results show that for the ion spectrum, the signal-to-background ratio can be significantly improved by using a quintuple-frequency probe beam. For the red peak of the electron spectrum, whether a quintuple-frequency probe beam or a quadruple-frequency probe beam is used, it is strongly disturbed by the intense background of the drive beam. For the blue peak of the electron spectrum, the drive beam background can be avoided by using a quintuple-frequency probe beam, while the bremsstrahlung background will be significantly enhanced. In general, quintuple-frequency Thomson scattering has significant advantages in the measurement of low atomic number plasmas, but not for high atomic number plasmas.