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In the current study,the treatment of air/water interface has been made on dam-break induced tsunami-like wave by the Coupled Level Set and Volume of Fluid (CLSVOF) three-dimensional modelling.The overall CLSVOF method adopts a Tangent of Hy-perbola for INterface Capturing (THINC) scheme with the Weighted Linear Interface Calculation (WLIC) and Level Set (LS) function for capturing interface and calculating normal vector,respectively.As far as THINC/WLIC scheme is concerned,since the convection problem of the VOF function can be solved well,the numerical diffusion can be avoided.The spatial terms in the LS equation were discretized by the Optimized Compact Reconstruction Weighted Essentially Non-Oscillatory (OCRWENO) scheme with fourth-order accuracy,which can avoid false oscillation of LS solution.By combining CLSVOF method with Immersed Boundary (IB)method,the simulation of dam-break induced tsunami-like wave impacting on a stationary breakwater can be carried out.Grid sensitivity,mass error and free-surface profile are first calculated for the tsunami-like wave problem to validate the proposed numerical algorithm,which shows excellent agreement between the numerical results and experimental data.Tsunami-like waves with varied tailgater levels are then investigated.Calculations of velocity magnitude,free-surface profile and wave elevation of the tsunami-like wave are conducted to investigate its dynamics and kinematics.