Abstract: Based on the data from the Xiangyun Island Observatory in 2017 and 2018 and two gradient wind towers from 2011 to 2013, the sea-land breeze and turbulence intensity on the northern Bohai Bay are studied with aim to understand the characteristics of turbulence intensity under strong wind conditions in different weather systems. Results show that the characteristics of sea-land breeze on the northern Bohai Bay are obvious during the turning of day and night wind directions from SSW to ENE, which is more significant in summer. Overall, wind speed increases and turbulence intensity decreases with height. The turbulence intensity in the near-sea layer is smaller than that in the near-surface layer. Seasonal turbulence intensities are evidently characterized by higher value in summer and lower value in winter and no obvious changes in spring and autumn. The changes of turbulence intensity are more flat in the near-sea layer than in the near-surface layer. The turbulence intensity at 70 m and below on the near-sea layer is stronger than that on the near-surface layer during easterly strong winds. The turbulence intensities of the near-sea layer and the near-surface layer increase and wind speed decrease with height, especially during the thunderstorm. When typhoon is approaching to the wind tower, the wind speed at each layer increases significantly while the turbulence intensity changes insignificantly. However, the turbulence intensity rapidly increases to the peak at the arrival of typhoon center, which is one hour earlier than the appearance of minimum wind speed. About 8%-10% turbulence intensity samples, which were from the near-sea and the near-surface layers, exceed the IEC-61400 design standard. It is recommended that the antiturbulence parameters of wind turbines on the northern Bohai Bay be adjusted to 0.43-0.49.