"Cave Channels" theory suggests that in the hailstorm there are "Cave Channels", which are decided by flow fields and water materials.In this paper,the large scale information obtained from MM5V3 model, the hailstones formation and growth is simulated with 3D cloud model. The results show that 1)if the space distribution and positioning of temperature, the vertical airflow, the horizontal wind "0-line" region and 5 category hail and 5 hydrometeors met the needs of the "cave channels "("CC"), the hailstones water content are large.2)The small ice particles(D<1mm), graupel and hail embryos (1-5mm), small hailstones(5-10mm) have another high water content region over -30~-50 C altitude at the hail formation initial stage, between two of high center there is a clear low water content space, which means there are two different hailstone formation mechanisms.3)The hail suppression region are "CC"regiosn.