During the fast filling of hydrogen vehicle cylinder there will be significant temperature rise, and the temperature rise should be controlled under the temperature limit (85 C) of the structure material, because it may lead to the failure of the structure. In this paper, a 2-dimionsional axisymmetric computational fluid dynamics (CFD) model for fast filling of 70 MPa hydrogen vehicle cylinder is presented. The numerical simulations are based on the modified standard k - ? turbulence model. Additionally, both the equation of state for hydrogen gas and the thermodynamic properties are calculated by National Institute of Standards and Technology (NIST) datebase: REFPROP 7.0. The thermodynamic responses of fast filling under different pressure-rise patterns and filling times have been explored by the simulation results.