To solve the problem of lacking prototype data in study of strong sea wind characteristics,aprototype measurement work for wind characteristics near sea surface is carried out on a semisubmersible platform in LH4-1 oil field in South China Sea.The data collected in the day,22 September 2011,is analyzed to obtain wind characteristic parameters near sea surface,such as turbulence intensity,gust factor and integral scales of wind turbulence,etc..Fluctuating wind power spectrum is also calculated by prototype d...