The Changjiang Estuary and its adjacent waters (CJEAW) have the highest concentration of suspended particulate matter (SPM) and the most severe seasonal hypoxia in the world. Based on this, selecting 29°N-34°N and 120°E-127°E as boundary the study area, it is found that the Changjiang carries a large amount of SPM to the CJEAW every year. Under the comprehensive action of topography and ecological dynamic conditions, a relatively stable dual frontal structure is finally formed, and the SPM distribution shows great spatial differences. The analysis shows that the CJEAW generally are second-class water bodies, and the light attenuation process is mainly dominated by SPM. Under the control of the dual fronts, the latitudinal primary productivity pattern of "low-high-low" is finally created, and the bottom water in the high-productivity sea area is hypoxic seriously. It was found that the isobaths of 20 m and 50 m was the boundary of the dual fronts and the high productivity area. Therefore, the study area was divided into three subregions. The parameterization scheme between PAR attenuation and turbidity in different zones was established by using the large-scale survey data in the summer of 2020. By comparing with the previous schemes and the unpartitioned scheme, the reliability and superiority of the partitioned schemes are further verified by the measured data. It is of great significance to explore the parameterization scheme of PAR attenuation through zoning treatment for further understanding the ecological dynamic mechanism of hypoxia in the Changjiang Estuary.