Abstract: This study examined the temporal variation of sand dune at Emerald Island since 2008. Datasets used in this study include site meteorological observation, Bohai sea ice detection, sand dune flow-meter, and image monitoring. The results indicated that, with the reduction of sand yield from rivers to the western sea, hydrodynamic force automatically restored coastal sand deposit sediment. Sand dunes moved slightly between under the influences of environmental wind fields. Prevailing winds in different seasons contributed differently to the sand dynamical movement. Compared with the data in 2008, the sand dune height along the coast has increased by 1.5-1.8 m in general, with an average increase of 20-30° in seaward and reverse seaward.Further results showed that sand dune height variation was related to sea ice period. Once the Bohai sea ice edge was extended over 20 km, the horizontal pressure gradient increased as a result of the sea-land air temperature difference and the sea ice friction coefficient decreased. This resulted in an increased intensity of easterly wind on the sea ice, which was mainly responsible to the increased sand flow.