The coastal topographical variation is much related to the conservation of national land. The coast line of Hua-lien has changed a lot in recent years. If the northern part of Hua-jen jetty is taken as a division, the Hua-lien coast could almost be regarded as deposition in the north and scouring in the south. This study adopts three models including the RCPWAVE model, the modified HHM and a quasi-three dimensional coastal hydrodynamic model to simulate the flow near the shore of Hua-lien. The results show that the variation trend between the flow and the coast is in good agreement. The flow controlled by seasonal waves will move northward along the coast and slow down around the estuary of Mei-luan Creek, resulting in deposition of sand drift in the long run.