An analysis is made of the data from lightning position finders and radar echo data in 6 hail processes in Shandong Province. The results indicate that there was a regular variation in the 10min frequency distribution of lightning, with the peak (10 times) appearing 32 to 220 minutes before hailing; the positive lightning strikes increased rapidly two hour before hailing and then decreased rapidly. The positive lightning occupied basically above 50% of the total lightning before hailing, and lightning strikes distributed basically within the range of radar echoes. The lightningconcentrated areas did not completely correspond to the strong echo areas, but the movement of the lightningconcentrated areas can indicate the moving and developing track of hail clouds. The lightning frequency, the ratio of positive lightning to total, and the lightning time series can be used as references in hail warming.