For the float glass process, a simplified steady multiphase model was proposed for the simulation of glass melt forming process in the tin bath entrance area. The Ansys Fluent 2019 R3 software package was employed to simulate the glass melt flow and forming process for a tin bath with pull rate of 500 t/d. The flow behavior and layer thickness distribution of glass melt at spout lip and restrictor area were investigated with different pull rates and viscosities. According to the results, the glass melt layer becomes discontinuous with small pull rate or viscosity, and the uniformity of layer thickness in transverse direction gets worse with extreme large pull rate or viscosity. Finally, the optimized operation condition for float glass forming process of the sample tin bath is pull rate of 400~550 t/d and viscosity of 400~600 Pa·s.