Abstract: In this paper,the raindrop data collected at Conghua station in Guangzhou area in June 1994 have been analyzed. It is found that the June rainfall doing great flooding damage has some features: raining time. rainfall intensity,raindrop density and scale are also larger. The largest raindrop diameter and rainfall intensity are 6.5mm and 155. 06mm/h respectively. On the other hand,according to weather system and rainfall feature,we divided rainfall into five types and provided a group of Z-I relationship that can be referenced and used in radar quantitative measurement of rainfall.