The velocity data for a single Doppler radar have been used in this paper to compute the feature values such as one dimensional radial shear,one dimensional elevation shear and two dimensional radial and elevation shear,and the effect of airflow on airplanes has also been analised.The study is to recognize the areas of wind shear,verify the observations of microburst,mesocyclone and gust front,and define the potentially dangerous areas for airplane during landing and taking off.The system can be regarded as an efficient tool to guarantee a safe flying.