For the problem of pressure oscillations in pipeline caused by hydraulic impact in the hydraulic system, a horizontally-mounted with constant cross-sectional area pipe which connected to a tank and a directional valve is used as physical model of study. By discretizing the pipe as well as taking frequency-dependent friction into account, the sectional lumped parameter model and the principle for the choice about the submodel of the pipe were established. AMESim was used to solve the model, characteristics of pressure oscillations in pipeline were obtained in concerning complex fluid phenomenon. Meanwhile, the influence law of the pipeline parameters on pressure oscillations were determined through simulation analysis. The results show that as compared with the theoretical method, the AMESim calculation peak pressure error is 1.5%. Compared with the Simulink method, the AMESim error is 6.8%, as well as in the dynamic process, the pressure curves are in good agreement with Simulink method, which proves the validity of the modeling and simulation method. The method of AMESim gives a new approach for analysis the pressure oscillations and hydraulic impact in pipeline.