Introduction  In order to solve the safety problem of towing transportation of floating OWT（ offshore wind turbine ), the towing characteristics of fully submersible floating OWT are studied.

  Method  The model of the fully submersible floating OWT towing system was established through Moses software. For the towing process, five groups of sea conditions were set up for simulation, the numerical model calculations were carried out, the influence of wind speed and wind wave direction on towing response of fully submersible floating OWT was studied. According to the analysis results, some suggestions were put forward to help the towing safety of the fully submersible floating OWT.

  Result  The results show that, compared with rolling, the pitch and heave of the fully submersible floating OWT are more obviously affected by the wind speed, and the greater the wind speed, the greater the motion amplitude; when the wind wave direction is 90°, the rolling of OWT is greatly influenced by the wind wave direction, and when the wind wave direction is 0°, the pitch and heave of the OWT is greatly influenced by the wind wave direction.

  Conclusion  On the premise of ensuring that the towing process is within the towing window period, it is suggested that the fully submersible floating OWT should be towed against the wind in practical engineering to reduce the risk of vibration and resonance of OWT. At the same time, we should try our best to avoid the situation that the wind direction is perpendicular to the towing direction, which will easily lead to a large degree of rolling and make the towing process more dangerous. When towing against the wind, the motion response and towing force of the fully submersible floating OWT can still meet the requirements of safe towing at a large wind speed of 30.9 m/s exceeding the average sea condition.