Analysis and forecasting for hail weather's form and development are presented based on radar detection information, surface meteorological observation and computer analysis and processing.With calculation of the covered area of multicell hail's centre, and determination of hail's exact sites which is relative to different space area, the hail cloud simulation model is developed, exact place where the shell falls at length is determined. After calculation of the water contents in cloud, the height of 0℃, and cloud volume, the shooting point at the operating area are given.