RNG turbulent model combining with VOF method, porosity method and wall function was used to simulate and research the flow around a spurdike. To research and analyze the character of flow around the spur dike in model test subtly, an instrument marked PIV was used in a glass flume test. The computed results and the data obtained by the authors in test and previous authors information were compared, and they agree well. This result shows that the model can simulate the flow and free surface around a spurdike under many conditions.