Abstract: Offshore wind power dynamic cable is an important piece of equipment in offshore wind power systems.When the dynamic cable is working in place, it will withstand repeated alternating loads and fatigue failure under the interaction of offshore platform movement, wind, wave and current loads, resulting in huge economic losses.Due to complex cross-sectional form of dynamic cables, it is difficult to accurately predict their fatigue life. Based on fatigue analysis methods of deep-sea risers and umbilical cables, overall analysis and time domain analysis for the supporting cables of a 66 MW floating wind turbine platform were conducted, under the field sea conditions.Obtained simulation results were applied to finite element analysis, and finally corresponding multiple scaling was conducted in FE-SAFE to achieve the purpose of fatigue calculation, which could give a complete set of fatigue analysis methods for dynamic cables.