Abstract: The coastline has significant influence on the ecological environment, tidal flats of intertidal zone, wetland ecological system in the coastal areas and so on. Based on the remote sensing and the GIS technology, the coastline data of Weihai, Shangdong Province, is extracted and vector quantized in 6 periods of 1988, 1994, 1999, 2007, 2014 and 2017 in order to study the driving forces and spatiotemporal variation of Weihai coastline in recent 30 years.Thus, we draw the following conclusions: the coastline changes in Weihai are mainly the reflections of the proportion of the length of different shoreline types. In terms of total length, the coastline shows a trend of continuous growth, increasing by 74.7 km at a rate of 2.49 km/a in 30 years. In terms of shoreline types, the area is dominated with artificial shoreline by dams of aquaculture activities. It accounts for 39.4% of the total length of the shoreline. The spatial and temporal changes of coastlines and the driving forces analysis show that the changes are driven mainly by human factors which may change the resources and ecological processes of the coast and affect directly the conditions of survival and development of the local community.