Based on constant altitude p lane data of reflectivity factor from new generation weather radarwhich are interpolated with 3D - Barnes scheme, vertically integrated liquid water content (V IL) of hail cloud cell calculated with its theoreticalmodel, vertically integrated liquid water content density( V ILD) calculated by the ratio of V IL value to top height of hailcloud cell, the daily variation character, size distribution and the relations between the maximum diameter of hail on the ground (Rmax) and V ILmax, as well as V ILDmax of hailcloud cell during hail fall on the northeast of Tibetan Plateau are studied with statistic method. Results are as follows:(1)On the northeast part of Tibetan Plateau, hail fall was mainly in middle size hailstones ( diameter range: 5 - 20 mm) , and then smaller size hailstones ( diameter less than 5 mm) , larger hailstones ( diametermore than 20 mm) occurred less; (2) Local hail fall occurred mainly in the afternoon and evening, and there are two peak periodswhich are from 15: 00 to 16: 00 and from 20: 00 to 21: 00,and this result is accordant to the former research of Chen qian et al. on the whole but earlier in occurring period; ( 3) As a whole,there is a positive correlation between Rmax and V ILmax orV ILDmax, but the correlation between V ILDmax and Rmax is better; some difference exists in V ILDmax values of hail cloud cells corresponding to the same size hail but it is small and less than 0. 1 g. m - 3 ;( 4) The cone of silence for radar detecting, strong echo area leaning and echo overhanging of hail cloud cell are major factorswhich resulted in negative correlation between Rmax and V ILmax orV ILDmax.
