The purpose of this study is to clarify the application of the atomization enhancement nozzle developed in this study to the high-ambient pressure and the intermittent spray. In this paper, the effects of the ambient pressures on atomization of the spray of the atomization enhancement nozzle, and its application to the actual Diesel injector were investigated. Moreover, the correlation of the atomization characteristics between the enlarged nozzle and the actual size nozzle were investigated. The results show that the atomization enhancement nozzle developed in this study was obtained the excellent spray and the spray characteristics which the breakup length is short, the spray angle is large and the droplet diameter is small. Moreover, approximate correlations between the enlarged nozzle and the actual size nozzle were obtained. Furthermore, it was clarified that the spread of the spray of this atomization enhancement nozzle becomes large compared with the single hole nozzle at the high-ambient pressure of Pa =1.6 M-Pa at the room temperature.