Abstract： The resonance phenomenon of soft yoke mooring system (SYMS) transverseoscillation and tanker rolling was analyzed by the method of phase analysis to solve the problem of transverseoscillation in the SYMS of floating production storage and offloading (FPSO). Fatigue analysis method of the SRA transverseoscillation was studied. The upper hinge point of the SYMS was taken as an example. The number of cycles of upper hinge point in oneyear was counted by rain flow counting method, and the number of cycles in 15 years could be calculated. Therefore, the fatigue damage under the cycles of 15 years could be calculated by finite element analysis. The results show that the fatigue damage is up to 0.57. There exists a risk of fatigue failure in design life. It is urgent to find a practical and reliable method to reduce the impact of resonance.