The present paper deals with both the computer simulation and statistical study of sporadic E-layers at mid-latitude regions. According to the widely accepted wind shear theory, simulation for the formation of Es under the action of wind fields and electric fields was carried out. The simulation work is based on the continuity equation and momentum equation and method of characteristics curve is adopted. We accomplish simulating the convergence of metal ions to form a thin layer under reasonable dynamics conditions. The wind field data come from the HWM93 empirical model and the electric field data from the drift empirical model. The results of simulation confirm the validity of the wind shear theory indirectly. When changing the input parameter of the HWM93 empirical model and the drift empirical model, we obtained different results, which make it possible for us to study the reaction of Es peak density on the diurnal and seasonal variations of the background dynamics conditions. The results agree with the statistical temporal variation feature of the sporadic E occurrence. After a comparison of data statistic results, the reliable part of the theory is confirmed and its irrationality is discussed.
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