The eastern coastal area in China is a region that has undergone heavy industrial development in the past 40 years.  The severe air pollution problems in this region, such as acid rain in 1980s, haze in 2010s and complex air pollution currently, is caused by the large population and energy consumption. So far, the effect of pollutant transport from this region to the downwind areas is still unclear, especially for the offshore areas. The relationship between continental anthropogonic emissions and marine biogenic release is the key air-sea interaction. Biogenic dimethyl sulfide (DMS) emitted from the seawater has attracted academic interests because of the CLAW hypothesis, that describes a negative feedback loop between a surface ocean ecosystem and clouds. This presentation summaries our researches in the eastern coast of China since 1990, including (1) The measurements of DMS flux and its influencing factors; (2) Characteristics of marine aerosol and new particle formation; (3) Source-receptor relationships of air Pollution.