Based on Landsat TM images of 1990,2000and 2006and“HJ-1”Satellite image of 2011,land use/cover changes from 1990to 2011in Qingdao City were analyzed using a system dynamic model.There were significant changes on land use/cover in Qingdao City in the past 21years(1990-2011).The areas of farmland and grassland decreased,while the areas of rural,urban,mining and residential lands increased.Forest area was reduced first and increased later,and water area and unused land went to the other way.The degree of land use became greater year by year,which indicates that Qingdao City was in the stage of land use development and the strength of land use was enhanced to a higher level.Spatially,distinct changes took place in the middle and eastern areas of the city,and a relatively small change,in the north and south-west areas.The conversion of land use type was complex,but it mainly changed into the rural,urban,mining and residential areas.