Two severe convective weather events are analyzed. The results show that this two events are similar in many aspects, Such as, the effect system, physical element fields and the radar echo features etc. The couple of the dynamic fields in upper and lower layers provides the dynamic condition. Convective weather occurred in the place of low-level front zone of dew point, and the place of convergence in the lower level and divergence in the upper level as well. The larger the difference between the convergence and divergence in upper and lower layers is, the heavier the rainfall is. The descending inflow jet appears at the back of the bow echo on the map of Doppler radar base reflectivity fields, the larger the corresponding radial velocity is, and the more rapid the movement of radar echoes is, the larger the wind on the ground is.