In order to make sure the normal living of marine organisms are not affected by the operation of offshore platform, the bubble curtain noise reduction system is installed on offshore platform. Taken the bubble generation pipe as the research object, the volume fraction of the bubble curtain is calculated by STAR-CCM+, and the influence factors including the number of orifices, the arrangement of orifices, the diameter of orifice and the ventilation capacity are analyzed. The results show that the influence of the ventilation capacity on the volume fraction is the most significant, followed by the arrangement of orifices, and the influence of the number of orifices and the diameter of orifice is less.