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The present oil spill models are usually based on sea surface, while few of them are for submarine oil spill. Therefore, modeling and simulation for submarine pipeline oil spill is discussed by FLUENT in this paper to forecast the trajectory of oil. The coupling of pressure and velocity under unsteady-state condition is solved by pressure implicit with splitting of operators algorithm, and the boundary condition of nonlinear free surface is solved by volume of fluid. The simulation that oil particles generate from submarine pipelines and rise up to sea surface by buoyancy action is carried out. Furthermore, the quantity and trajectory of spilled oil under different operating pressure and current velocity are compared and analyzed. The results show that the submarine diffusion scope of spilled oil is smaller with larger operating pressure or lower current velocity.