Laser communication is a new hot spot in underwater wireless communication. It′s the key in channel research to evaluate the laser transmission attenuation under seawater environment accurately. A new remote sensing inversion algorithm is proposed by synthesizing the existed QAA-RGR (Quasi-Analytical Algorithm Red-Green-Bands-Ratio) remote sensing inversion algorithm and the national satellite ocean application service (NSOAS) model, which can evaluate the attenuation coefficient spectra based on moderate-resolution imaging spectroradiometer (MODIS) land bands data directly. Compared the absorption coefficient spectrum and scattering coefficient spectrum, which is estimated by inversion algorithm with MODIS L2 level data, the feasibility of the inversion algorithm is verified. It is important to analysis and understand the optical properties of seawater at coastal areas dynamically.