Based on lots of the boundary layer observed data and weather station’s data for five successive years (1986~1990) over coastal land of Guangdong

some characteristics and variation of wind field in the boundary layer over the region are analyzed. The results reveal that compared with the wind field over the inland area

the mean wind speed is large

and that vertical wind profile which agrees with power law only appears in the layer near the surface. The sea land breeze is very active all the year round with seasonal differences. The stability varies obviously.