Fuel sloshing in a vehicle fuel tank generates a reluctant low frequency noise, called slosh noise. To reduce slosh noise, while many approaches have used the Computational Fluid Dynamics method in a fuel tank, This paper applies the Star CCM+ . It is to find the fuel flow pattern under without baffle condition. Next, It is to analysis the fuel flow pattern using baffles. The test results showed that impact of baffles to reduction slosh noise.