The backward scattering ratio is not only an important parameter of detecting seawater backward scattering signal based on airborne lidar,but also a very important optical property of oceanic suspended particles.Based on Mie scattering theory and scattering phase function,it puts forward a formula to calculate the backward scattering ratio.According to Mie scattering theory,the scattering phase function characteristics of alga particles and suspended sands are analyzed,and their backward scattering ratios a...