the concentration of chlorophyll is an important parameter to reflect the nutritional status of seawater,and the attenuation coefficient of spectral diffusion is a parameter to reflect the apparent optical properties of water,and the relationship between the two parameters is close.The vertical distribution of spectral diffused attenuation coefficient reflects the optical attenuation characteristics in the vertical direction,so it is of great significance to study the channel characteristics of underwater laser communication.In this paper,a new vertical attenuation model is proposed based on the existing vertical attenuation model of chlorophyll concentration established by MODIS data and the single-parameter (chlorophyll concentration) model of spectral diffuse attenuation coefficient.This distribution is compared with the diffuse attenuation coefficient vertical distribution established by the actual measured Argo data about the vertical distribution of chlorophyll concentration and the single-parameter spectral diffuse attenuation coefficient model.The results are roughly the same,which verify the feasibility of this model.In addition,the diffuse attenuation coefficient spectrum of different chlorophyll concentrations are analyzed,and the results show that the obtained attenuation coefficient is the minimum when green band is used in the turbidity sea and blue band is used in the clear sea.Compared with Argo data,MODIS data is more real-time and easy to obtain,so the attenuation model of vertical distribution proposed in this paper is more convenient to apply.