This study aims to examine the near-wall effect on dispersion characteristics of water droplets under the ultra-high injection pressure conditions. We used the commercial computation fluid dynamics code (ANSYS FLUENT Ver. 17.0) for three-dimensional turbulent flow and the water droplet dispersion. We used SST k-w model for turbulent flow analysis and DPM(Discrete phase model) break up model for injection of the water droplet. The water droplets are injected to air with 175 m/s and the external air flow is present with 3 m/s. We compared and analyzed the characteristics of dispersion of water droplets with the consideration of the change in injection height ranging from 0.5 m to 2.5 m. The numerical analysis shows that the near-wall effect becomes significant on the water droplet dispersion.