This paper introduces an algorithm for retrieval of euphotic depth and digs out the relationship between the euphotic depth and the diffuse attenuation coefficient Kd(490) of the South China Sea based on in situ measurement data:zeu=2.784/Kd(490).

• 介绍了真光层深度的遥感反演算法；并根据实测资料；通过经验拟合得到南海海水真光层深度与海水漫衰减系数Kd(490)的关系:zeu=2.；784/Kd(490)。