This paper calculated 18 physical parameters and their 6h, 12h, and 24h variations by the sounding data from Beijing Nanjiao Observatory, and then analyzed the physical parameter differences of hailstone, thunderstorm gale, and storm rainfall from May to September in 2007 and 2008. The results show that, as the physical parameters, the 0 ℃ height, the -20 ℃ height, the difference of temperature between 500 hPa and 850 hPa, the inversion height and the lowlevel wind shear could distinguish the category of the rainstorm and hailstorm. Besides, the depression of dew point of 850 hPa and the difference of θse between 500 hPa and 850 hPa are also the important 〖HJ〗conditions. On the other hand, for the 6h variations of the CAPE, DCAPE， K index, the difference of θse between 500 hPa and 850 hPa, PW， and the vertical wind shear of the lower troposphere could also be better to distinguish the hailstorm and the storm rainfall. The results indicate that it is possible to distinguish the summer convective weather by better using of sounding data.