Using the tropical cyclone best track data of Joint Typhoon Warning Center (JTWC),the thresholds of tropical cyclone rapid intensification(RI) as 25 kt,30 kt,35 kt,are defined which respectively represent the 24 h overwater intensity changes of tropical cyclones in the Northwest-Pacific area.Results show that the vast majority of RI cases occur in September with 22％ of the RI cases that satisfy the RI thresholds occurring during 12 months.Cases with 65-70 kt initial intensities compose the largest fraction of RI cases.(12.5°N,130°E)is the high frequency center for tropical cyclone to undergo rapid intensification.%利用美国联合台风警报中心(JTWC)整编的热带气旋(TC)最佳路径资料,采用不同的方法,分别定义TC近中心风速24h变化达到25 kt、30 kt、35 kt为TC快速增强的阈值.统计结果表明:热带风暴和台风是快速增强热带气旋的主要组成部分.TC快速增强概率最高的月份是9月,分别达到了21.7％,22.3,21.9％；TC快速增强概率最高的初始强度是[65 kt,75kt).在菲律宾以东(12.5°N,130°E)为中心的区域是TC经历快速增强过程的高频率中心.我国的台湾岛和东南沿海附近也是TC经历快速增强区域.
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