Abstract:Based on CMA-STI data set published by China Meteorological Administration, Poisson-Gumbel distribution was used to estimate the extreme wind speed at sea, and the data of shangchuandao meteorological station for more than 60 years were verified by probability evaluation. Results show that Poisson-Gumbel distribution can be used to obtain a more conservative value of extreme wind speed at sea. For the estimation of return period wind speed in a small area on the sea, a 50 km radius area can get a more reasonable estimation result. When the evaluation area is large, it is necessary to consider expanding the evaluation radius appropriately.