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A level set/immersed boundary method for numerical simulation of dam-break flow over an stationary object is presented.This approach uses a level set approach and immersed boundary formulation for fluid-fluid and solid-fluid interface treatments,respectively.The incompressible Navier-Stokes solutions are calculated effectively using the projection method.For accurately predictiong the fluid-fluid interface, the weighted essentially non oscillatory (WENO) scheme is applied to approximate spatial derivative terms which are shown in the advection equation and re-initialization equation of level set approach.Numerical results show that the interface preserving method can preserve mass very well for dam-break problems.