With the CINRAD/CD Doppler radar and T213 numerical production,a thunderstorm with sandstorm,and strong wind was continuously monitored and analyzed in the central-southern areas of Inner Mongolia autonomous.It shows that before the sandstorm appeared,the convergence center of the low level divergence coupled with the center of the vertical rising movement,and with the rebellious wind area of radar data.The intensity of physical field approached or even exceeded the ones of local heavy rain or strong convection weather.The relative humidity is badly poor above the sandstorm region,especially at the lower level.The analysis of CINRAD/CD Doppler radar data indicates that the severe sandstorm and wind appeared because of the strong converging and revolving of the meso-γ scale system.The great reflectivity area overlapping the heaviest positive/negative speed area,and the strong shear between the positive speed and the negative ones,strengthen the converging and revolving of the meso-γ scale system.The strong sandstorm emerged in the converse wind area of the meso-γ scale system,while the strongest wind beside the sandstorm appeared in the projecting position of the bow-shape echo,the outflow or in the radial speed picture.