Waves,ship wakes,marine life swimming and breathing lead to a large number of microbubbles in seawater and the scattering effect caused by the bubble group has an important impact on the underwater transmission of optical signals.However,the typical channel model of underwater wireless optical communication generally does not take the negative effect of bubble groups in account.To further improve the traditional channel model of underwater wireless optical communication,the light scattering characteristics of little microbubbles or microbubbles groups in sea are analyzed using Mie scattering theory.Based on the Monte Carlo method,a composite communication channel mode of sea water is established,and the optical characteristics and signal characteristics of the receiver under parameters or conditions of different qualities of sea water,bubble densities and link distance are analyzed.The results show that when the link distance is 5 meters,with the increase of bubble density,the dispersion of the light spot at the receiving end is intensified,and its area can be increased to 3～5 times of the initial size.The central energy is also significantly reduced to 0.5% of the maximum value.When the link distance is 10 to 40 m,the existence of the bubble group and the increase of the link distance will cause the receiving end to extend the time of receiving the first photon by about 10～200 ns,and the pulse broadening value will increase.At a link distance of 2～10 m,the increase of bubble density reduces the normalized receiving power to at most the 0.004% of the initial value.However,as the water quality deteriorates and the content of other particles increases,the influence of the bubble group on the receiving power gradually decreases.This study can provide a reference for the design and theoretical analysis of underwater wireless optical communication systems.