The propagation and distribution of NIWs in the open ocean are affected by many factors: location and timing of wind storms; the general NIW trend of equatorward-and-downward energy propagation; blocking or trapping by upper ocean currents and relative vorticity distribution; and drainage of NIW energy in deep anticyclones. The distribution of near-inertial waves (NIWs) is investigated using data mainly from an array of 46 near-bottom acoustic current meter sensors spanning a 600 km*600 km region as part of the Kuroshio Extension System Study during 2004–2006. Using vertical round-trip travel time data from pressure-sensor-equipped inverted echo sounders (PIES), separate time-dependent variability of the near-inertial bands. The wintertime-mean mixed-layer NIW energy input, modeled from observed wind stress, has the same range of values the Kuroshio Extension in this region. The surface near inertial oscillation energy in the study area shows certain characteristics, bearing a statistically significant correlation to wind-induced near-inertial energy flux. Also, The relative vorticity is obtained by vertical round-trip travel time data inversion, and the relationship between the relative vorticity and the energy of near inertial oscillation is studied. Our study here provides evidence for the important role of near-inertial energy input from wind stress and the influence of relative vorticity in maintaining mixing in the ocean interior. Moreover,The correlation is obtained by comparing the NIW energy of the upper layer and the NIW energy of the lower layer,it is of great significance to study the inversion of deep ocean water.