Abstract: For important bridges,it is required by the Wind-resistant Design Code for Highway Bridges that a reasonable basic design wind speed be selected from the results obtained either by re-observing the basic design wind speed at bridge site or by referring to the samples of measured wind speed.In this paper,the design wind speed of Xiamen-Zhangzhou Cross-sea Bridge corresponding to different return period was calculated using three extreme value distribution schemes with the extreme value of the wind speed and its corresponding wind direction standard value taken from 360 months' 10-minute-time-interval observation by Xiamen Observatory and Longhai Weather Bureau.It is obtained that the 100-year return period expected wind speed at the bridge site is 35.8m/s,lower than 39.7m/s as given in the Code.