Abstract: Using hail radar echo data of three types of Hail Cloud in Liangshan Prefecture,it analyzed the radar echo intensity,echo ceiling height,height of strong echo center and vertical integrated liquid water content the main characteristics of parameter values and changes over time of au types hail processe were analyzed.The results show that,hail cloud echo intensity,echo top height and vertically integrated liquid water content and other parameters of the jump,drop are the important reference index to artificial hail warning,echo intensity and vertical integrated liquid water content appear decrease,which last general 2 individual about 12 minutes,the hail occured.The results apply a preliminary study of the bast operation opportuuity and the choice of radar echo criteria for artificial hail suppression in local area.