Abstract: Sea spray plays an important role in the air-sea momentum flux, heat flux and material flux. However, the differences among the sea spray generation rate estimated with different sea spray generation functions can reach up to six orders under the same wind speed condition. In previous studies, the wind speed was considered as the major factor in sea spray generation, while the wave effect was mostly ignored. This is probably one of the reasons responsible for the huge difference in the estimation of sea spray generation. In this paper, laboratory experiments are carried out in a wind-wave-current tank to measure the sea spray flux under wind only condition and wind with mechanical wave condition, respectively. The results show that the sea spray flux F under wind only condition is 5.49×10⁴ m⁻²∙s⁻¹. When the mechanical waves is considered, the sea spray flux F reduces significantly to 1.39×10⁴ m⁻²∙s⁻¹, ocean droplet generation was reduced by nearly three quarters. Moreover, the sea spray flux F decreases as wave length of mechanical waves increases, that is, the swell with the same direction as the wind wave reduces the wave breaking, thus reduces the sea spray generation. In situ observation data also indicate that the swell can reduce sea spray generation significantly. Laboratory experiments prove that swell suppresses the sea spray generation. These findings can help to improve the parameterization scheme of the sea spray.