The observational characteristics of cloud-ground lightnings and precipitation for 8 storms during 2000-2001 are investigated,and radar echo,and lightning feathures for two types of heavy-rain and hail-producing weather are analyzed detailedly.There are apparent differences of lightning features between heavy-rain and hail-producing weather.The hail-producing weather has more positive lightnings,and especially at the time just before hailfall the positive lightning frequency increases rapidly.In addition,it is also found that lightnings often occurred within radar echoes of more than 45 dBZ in the studied cases,which is a little higher than the 30-45 dBZ in mid-latitude region suggested by previous studies.