Abstract: In this paper, the circulation and physical characteristics of 7 Hail Events in Midwest of Guizhou in 2017 were analyzed, The results showed that the method of circulation type partitioning method from Wan Xueli et. are suitable for hail weather in Mid-Western Guizhou. The analysis of atmosphere background and physical quantities showed that such as 0℃ layer, -20℃ layer, temperature difference between upper and lower layers, CAPE,etc, where there is agreement with the standard, also there are inconsistencies. This indicates that the original physical quantity threshold should be improved.Using NCEP1°×1°re-analysis data, several other physical characteristics of environmental potential in the recent time of hail occurrence was analysised, the result showed that the characteristics of the physical quantity of convective weather were basically common, the intensity and disposition of physical quantity have certain indication effect on the intensity and type of convective weather.