Abstract: Movement of sand dune is a result of wind action.However,land surface wind is largely effected by local conditions of landforms.In the area of Altai, Xinjiang, moving directions of sand dunes are complex: in the half year from Apr.to Sep.sand dunes on the both sides of western Ertix River, and between the Ertix River and Ulungur River move eastward and southeastward.In the half year from Oct.to Mar.sand dunes on south side of the western Ertix River gentlely move northward, but sand dunes on the north side of the Ertix River move westward, or northwestward.The local weather is mainly effected by westlies and arctic air mass.Mongolian High Pressure obviosly acts upon the study area during the winter half year.The wind moves down southward mainly along the lower pass of middle part of the Altai Mt.and enters study area,then moves westward along the Ertix River,and acts upon the dunes of north side of the western Ertix River.In addition, higher relief of local londforms also directly effects on the wind directions, and controls the moving direction of sand dunes.