Using the wind field data observed by Zhejiang weather stations, the risk probability of the maximum wind speed and the days of gale wind of Zhejiang Province as well as ifs coastal area and its spatial distribution were analyzed based on the information diffusion theory. The results showed that the maximum wind speed which occurred once in 10 years is 10~20m/s in the majority of Zhejiang interior region, and in middle coastal 30~40m/s. The risk probability in July to September is higher than other months. The risk probability of strong gale or stronger is lower in winter and summer than in spring and autumn. The risk probability that the days of the maximum wind above 13. 9m/s reach 6 or 12d per month has obvious seasonal characteristic: Risk is higer in spring in Shengsi station; the higher risk months is from October to next March in Dachen island.%以浙江省各气象观测站风场数据为基础,根据信息扩散理论分析了浙江省及其沿海地区最大风速、大风天数的风险概率及其空间分布.研究表明:浙江内陆大部分区域10 a-遇最大风速为15～20 m/s,中部沿海为30～40 m/s；7～9月是沿海大风发生风险概率较高的月份,嵊泗站冬夏季节9级以上大风概率较低,春秋季节风险概率较高；7级以上大风6 d/月和12 d/月的风险概率有比较明显的季节性；嵊泗站在春季、大陈岛站在10月至次年3月相比其他月份风险概率较高.
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