Abstract: For analyzing the hydrodynamic performance of low aspect ratio vertical cambered otter board at different angles of inclination and angle of attack,the lift coefficient(C_L),drag coefficient(C_D),buoyancy coefficient(C_Z)and lift to drag ratio(K)were calculated through the tank model experiment.The experimental results were as follows:(1)C_L and K showed a trend of first increasing and then decreasing with the increase of angle of attack(α),C_D reflected an upward trend with the increase of α;(2)With no angle of inclination,when α=30°,the max lift coefficient(C_Lmax)was 1.699,in this case C_D=1.140,K=1.490.When α=15°,the max lift to drag ratio(K_max)was 2.421,in this case C_L=1.120,C_D=0.463;(3)When the heeling angle(β)changed between -10°-10°,C_Lmax=1.816(α=25°,β=-10°),K_max=3.405(α=10°,β=-10°).The otter board had a certain buoyancy when β was -5° and -10°,the average buoyancy coefficient was 0.16 and 0.25 respectively,when α was between 10°-30°;(4)When the trim angle(γ)changed between -10°-10°,C_Lmax=1.823(α=25° or α=30°,γ=-10°),K_max=2.729(α=5°,γ=-5°).The otter board had a certain buoyancy when γ was -5°,-10° and 5°,the average buoyancy coefficient was 0.16,0.18 and 0.16 respectively,when α was between 10°-30°.It is suggested that the best working scope of angle of attack was between 15°-30°,in which case C_L>1.1 and K>1.45.Finally compared the hydrodynamic performance of different types of otter board,we provided a reference basis for the rational use and further development of the new types of otter board.