Abstract: In this paper,not only the topographic maps of 1971 and 1981 but also the remote sensing images of 1981,1990,2001 and 2011 were used for investigating the land use change of reclaimed mud flats of Jiaojiang-Taizhou Estuary in the past 40 years or so.Based on the topographic maps and satellite images and supported by the GIS spatial analysis functions,the authors acquired the current land use status of five periods and the land use change matrix between each period of reclaimed mud fiats.The remote sensing survey results showed that in the past 40 years or so the trend of reclaimed mud flats of Jiaojiang-Taizhou Estuary was totally exacerbated and the types of land use were gradually increased.From 1971 to 1990,the land use types of reclamation zone mostly were converted into cultivated fields,breeding farms and reclamation land.After 1990,the upsurge of developing the reclamation of mud flats appeared.The beach and the reclamation land were converted into other land use patterns,such as cultivated fields,residential land,port land,and breeding farms.From 2001 to 2011,80.77% of the beach was converted into the reclamation land.The area of beach was reduced heavily.The expanding speed of reclamation of mud flats achieved the maximum in this period.