Based on marked summer thunderstorm features of lightning,conviction and precipitation, the space-time relationship between rainfall and Cloud-to-Ground (CG) are analyzed, which can be used to studies of thunderstorm analysis and corresponding data application. One strong,long-standing thunderstorm in Jiangsu Province and thereabout is chosen to analyze,leading to the fact that ①-CG is in the majority and its number density ratio is positive relevant to rainfall. At the beginning of storm, occurred time of -CG is ahead of rain with about 10 min. However,under the condition of increasing number density and intension of + CG,followed rainfall values are zero,which means the possibility of occurred hail or spout or electric charge reversion. ①About one-to-one relationship of time and space ,-CG is belter than positive one. Furthermore, this one-to-one value relation looks like power function.%从夏季雷暴条件下闪电、对流、降水3个显著特征出发,分析地闪(CG)与降雨之间的时空对应关系,为雷暴研究和数据应用提供个例支持.选择江苏省一次强度大、持续长的强雷暴过程,把降雨和CG资料按时问、空间、强度等分组对应,经分析表明,①-CG在总地闪中占绝对数量,大多数-CG数密度比例和降雨有正相关关系,雷暴开始初期,多出现负地闪时间提前于降雨约10 min的情况；当+CG数密度比例、强度均增加时,地面基本无降雨,配合雷达资料和云中电过程理论分析,可能是由于出现冰雹龙卷或者电荷反转造成；②-CG与降雨的时空一一对应关系优于+CG,且时空对应情况下两者数值关系类似幂函敌.
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