Molecular dynamics method is employed for studying the scattering of xenon atom from the platinum surface. After constructing the reasonable gas-surface interaction potential energy function, the stochastic classic trajectory method is adopted to solve the motion equation of both gas atom and solid atoms, then the trajectory and velocity of gas atom can be obtained. The results show that the scattering angle distribution differs from that of Maxwellian model while the speed coincides with the half-space Maxwellian distribution.