CDOM is one of the three-components of ocean color.The research of CDOM has been made for several decades

this article reviews the development history of CDOMS definition and the investigation of sources.Absorption coefficient and S are two important parameters.Two models for absorption by CDOM are the Exponential model（250—650nm） and Gaussian model（190—250nm）.Gaussian model offers a deeper understanding of chemical interaction affecting CDOM molecular structure while Exponential model is acceptable for optical modeling and remote sensing applications.There are three methods to calculate S parameter

and non-linear regression with background parameter is the one.That provides the best fit and makes the average of S with 13% improvement and the standard deviation with 72% reduction.Furthermore there is a strong linear relation between the absorption coefficient and the fluorescence.Absorption coefficient is not only the optical properties of CDOM but the base of remote sensing.This article summarizes several kinds of retrieval equations such as those for SeaWiFS

MERIS

MODIS and GLI color sensors.The retrievals of color sensors have different characteristics and difficulties

so the remote sensing of CDOM is expected to be more exact in the future.