中文摘要：

利用中国气象局上海台风研究所统计的1949—2009年热带气旋资料,对登陆我国热带气旋的频数及其占西北太平洋热带气旋年频数比例变化特征进行统计再分析,得出受热带气旋影响严重省份登陆热带气旋的频数变化特征.研究结果表明：登陆热带气旋年频数占西北太平洋热带气旋年频数比例总体呈上升趋势;而登陆热带气旋年频数总体呈下降趋势,登陆台风年频数线性变化趋势不显著;登陆广东省、海南省、台湾省和福建省的热带气旋年频数均呈现减少趋势,其中海南省减少最为显著.

英文摘要：

Frequency variations of landfall tropical cyclones（TCs） including the ratio of landfall TCs numbers to TCs numbers in the northwest Pacific were analyzed by using the tropical cyclones dataset（1949—2009） from China Typhoon Website,and the changes of landfall TCs numbers in provinces affected seriously were investigated.Results indicate that ratio of landfall TCs numbers to TCs numbers in the northwest Pacific increases,and the frequency variations of landfall TCs decrease,but the frequency variations of landfall typhoon are not obvious.Furthermore,the frequency variations of landfall TCs in Guangdong,Hainan,Taiwan and Fujian provinces also decrease,especially in Hainan province.