We study the wave attenuation performance of single-row floating flat-plate,double-row floating flat-plate,triple-row floating flat-plate,and perforated floating flat-plate breakwaters under the action of solitary waves through physical model tests,and compare and analyze four types of floating plate breakwaters in terms of their transmission coefficients,reflection coefficients,wave energy dissipation coefficients,and mooring tensions under different relative wave heights and mooring line inclinations.The results show that the transmission coefficient of the single-row floating flat-plate breakwater is the smallest,while that of triple-row floating flat-plate breakwater is the largest.Compared to the single-row floating flat-plate breakwater,double-row floating flat-plate,triple-row floating flat-plate,and the perforated floating flat-plate breakwaters exhibit significantly reduced mooring line tension.Moreover,moderately adjusting the inclination of the mooring line can also improve the wave attenuation effect of the floating plate and change the characteristics of mooring line tension.