Abstract: This paper establishes a multi-body dynamics model of a complete monopile offshore wind turbine considering the pile-soil interaction effect. A co-simulation model is then built. Finally,a single-TMD（STMD）system and a multiple-TMD（MTMD）system installed in the nacelle are designed and evaluated under the normal operation and the parked cases. The results show that the TMD systems exhibit better performance under the parked case than under the normal operation case. The standard deviations of the towerbase bending moments are suppressed more significantly than other evaluation indices. Furthermore,it is found that there is nonlinear relationship between the TMD number and the performance of MTMD.