【正】 In the framework of classical trajectory model the Langevin random force is included in the mo-tion equations.The phase space distribution of an ensemble of trajectories for the <sup>58</sup>Ni+<sup>58</sup>Ni reaction isgiven in the proximity model and Gross-Kalinowski model,respectively.The fusion probabilities for the<sup>100</sup>Mo+<sup>100</sup>Mo and <sup>86</sup>Kr+<sup>123</sup>Sb reactions are calculated by Monte Carlo sampling of Langevin trajectories.