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Two floating structures in close proximity are very commonly seen in offshore engineering.They are often subjected to steep waves and,therefore,the transient effects on their hydrodynamic features are of great concem.This paper uses the quasi arbitrary Lagrangian-Eulerian finite element method (QALE-FEM),based on the fully nonlinear potential theory (FNPT),to numerically investigate the interaction between two 3-D floating structures,which undergo motions with 6 degrees of freedom (DOFs),and are subjected to waves with different incident angles.The transient behaviours of floating structures,the effect of the accompanied structures,and the nonlinearity on the motion of and the wave loads on the structures are the main focuses of the study.The investigation reveals an important transient effects causing considerably larger structure motion than that in steady state.The results also indicate that the accompanied structure in close proximity enhances the interaction between different motion modes and results in stronger nonlinearity causing 2nd-order component to be of similar significance to the fundamental one.