Abstract: For the purpose of studying light attenuation principle of warship foam-water dual-purpose curtain, the visible light scattering model was established for calculating the optical scattering intensity distribution based on geometrical optics. Light intensity scattered by spherical foam/water drop restricted by scattering angle from 1 to 10, relative bubble radius r from 0 to 0.99 and liquid refractive index m2 within 1.20 to 1.50 was calculated using the computational model above. Results show that light is scattered strongly by the foam/water drop. The ratio of scattering intensity to incident intensity T increases by at most 2 orders of magnitude along with the increase of from 1to 10. T reduces up to 11.6% along with the increase of m2 from 1.30 to 1.40. T firstly declines and then increases to the extent of 0(minimum) and 80.8% (maximum) with the increase of r. The optimized bubble radius ro, corresponding to the lowest T value, enlarges from 0.1 to 0.4 with the increase of scattering angle and the decrease of liquid refractive index. The research can provide theoretical foundation for the development techniques of warship foam-water dual-purpose curtain.