中文摘要：

本文利用舟山市所属定海基准站、嵊泗基本站的气象观测资料，结合舟山群岛的地理特点，对雷电活动重要参量：如雷暴日数、闪电日数、雷暴时数、首次雷暴方向等进行统计分析，得出年雷电活动日数，逐月平均雷电活动日数，以及逐时雷暴时数等数据，并根据IEEE推荐的经验公式，计算地闪密度，发现舟山群岛每年7月雷电活动最为频繁，晚上20-21时达到全天雷电活动的最高峰，年平均雷暴日数明显小于大陆邻近地区等特征，所得结果对雷电预警有重要意义。最后，针对单纯利用气象观测资料分析雷电所存在的局限性，指出舟山群岛雷电特征的进一步研究方向。

英文摘要：

This paper was based on the meteorological observation data of Dinghai standard station and Shengsi basic station, and the geographic characteristics of Zhoushan islands. Through statistic analysis of some important thunderstorm and lightning activities parameters, i.e. thunderstorm days, lightning days, thunderstorm hours, directions of first thunderstorm, the annual thunderstorm and lightning activities days, the monthly thunderstorm and lightning activities days and the hourly thunderstorm hours on the average were obtained. Furthermore, the cloud-to-ground lightning densities were calculated applying some experience formulae of IEEE. We discovered that the thunderstorm and lightning activities happened most frequently in July, the top values appeared from 20：00 to 21：00, and the local area had less annual thunderstorm days on the average than neighboring regions, and so on. The results of this paper might be useful to forecast and warn lightning. Finally, it was discussed that only applying manual me- teorological observation data to lightning analysis was so incomplete that other advanced measures were necessary and a further research direction of characteristics of lightning in Zhoushan islands was pointed out.