The tracing observation of hail clouds around the Changjiang River and Huaihe Valley was conducted by using CINRAD/CC radar at Maanshan. The atmosphere stability and convection available potential energy (CAPE) of the hail clouds are analyzed by means of CINRAD/CC data and the atmosphere stratification thermodynamic structure data. The results indicate that in the hail event there existed inflow gap and threebody scatter spike (TBSS) on the PPI, strong echo pendency and limitary weak echo region (WER) on the vertical crosssection. The analysis of meteorological data such as storm tracking information (STI), vertical integrated liquid(VIL), and mesocyclones verifys that the maximum diameter of the hailstones is about 50 mm.