Abstract: In a twin-roll strip casting process, the metal flow and temperature distribution in molten pool have a direct influence on the stability of this process and the quality of products. Using a 3D finite element coupling analysis of the temperature and flow fields, a numerical simulation of the twin-roll casting of stainless steel was conducted to investigate mainly the effects of the exit angle and depth of a submerged nozzle in molten pool on the two fields. Simulation result showed that when the exit angle of submerged nozzle is greater than 15°, a double-turbulence is found in the molten pool, which not only changes the metal flow and distribution of solutes, but also affects the temperature field in molten pool. Thus the temperature differences among different positions on the surface of molten pool decrease to improve the surface quality of cast strip. When the submerging depth of nozzle increases the surface temperature at molten pool lowers. While the nozzle is submerged shallowly, the temperature differences among different positions on the surface of molten pool increase to damage the surface quality of strip. The simulation result provides a theoretical reference to the reasonable design of the nozzle during twin-roll strip casting.