The third and fourth harmonic outputs at 354.7 nm and 266.0 nm for Nd∶YAG pulsed laser are both within the ultraviolet wavelength band, and can be selected as the pump sources of a water vapor Raman lidar. Based on the practical construction of a water vapor Raman lidar system and from the aspects of backscattering coefficients, extinction coefficients, atmospheric transmissivity, ozone absorption and background noises, the detection performances of this lidar system are analyzed. The effects of the 354.7 nm and 266.0 nm laser sources on the daytime water vapor detection by this Raman lidar are investigated. The results show that the 266.0 nm laser and its corresponding vibrational Raman wavelengths of oxygen, nitrogen, and water vapor are all within the blind ultraviolet region, not affected by the solar background noise but affected by the ozone absorption. At 354.7 nm, there is no ozone absorption, but it is still influenced by the solar background noises. When the parameters for this wavelength selector system are kept the same, the effective detection range of daytime water vapor obtained by the designed Raman lidar is 2.7 km when the 266.0 nm is selected as the transmitter wavelength. In contrast, if 354.7 nm is selected, the effective detection range is only 0.6 km. The solar blind ultraviolet wavelength selection can effectively increase the detection range of daytime water vapor by Raman lidar and ensure the realization of all-day water vapor detection.