Abstract: According to the theories of structure dynamics and the aerodynamics, based on Navier-stokes and k-ε equations turbulent model, the metro train head aerodynamic model was deduced. The outside flow fields around B-type metro vehicle with streamlined head and three new train heads designed by changing the profile or length of longitudinal projection were simulated with 3-D incompressible viscous fluid theory. This paper analysed metro train's dynamics and pneumatic characteristics and pressure distribution while running in the tunnel, calculated its air resistance coefficient, and optimized the head shape to diminish aerodynamic resistance and made the metro train heads beautiful and full of times sense.