Abstract: Observation and analysis of salty dust in the air near coastal windbreak forest show thatatmospheric salty dust can be intercepted and adsorbed by the windbreaks, its mean subsidence amount is 4.3μg· m^-3·100m^-1in the region without windbreaks, and is 18.4μg·m^-3·100m^-1in the region with ones.The adsorption amount of it by the windbreaks la related to the tree species and their size of branches and leaves.The adsorption amount of Cl^- and Na⁺ by Platycladus orientalis is 6330 and 3350mg· kg^-1,but that by Pines thunforii is 1570 and 950 mg· kg^-1 The atmospheric salty dust is depended on the weatherand wind speed.On cloudy day, the greater wind speed is,the higher salt content in theair and the farther transported distance are.

Key words: Coastal windbreak forest, Salt ions, Salty dust, risk assessment code method., heavy metal, chemical speciation, agricultural soil, potential ecological risk index