The Yellow River delta as a frequently changing area has been studied by using 3S techniques for us to best understand coastline dynamics of the Yellow River estuary.According to the trait of near-infrared wave which has the lowest reflecting ratio in water,the yearly coastline dynamics had been extracted by remote sensing technique during 1976 to 2002.Consequently,the overlay analysis of annual change of coastlines,supported by GIS technique,showed that the coastline stretching distance,the coastline length,and the renewed land area had fluctuated increasing trends in the research period.The changing trends could be divided into three stages obviously in more detailed temporal scales,the first was linear increase stage from 1976 to 1985,the second was fluctuating stage from 1986 to 1996,and the third was decreasing stage during 1997.Due to observation data of the Lijin Hydrological Station which is located in the Yellow River estuary,dynamics of the sediment carrying capacity of the Yellow River had been studied in the same temporal scale.There were significant yearly changing trends during research period,the carrying capacity of the 15 years changed more than 15kg/m3 during this period of time,and the maximum yearly changing rate of the carrying capacity reached 33.04kg/m3 between 1987 and 1988.In the general,the changing trend of the carry capacity of the Yellow River fluctuatedly decreased in the research period.Correlation analysis indicated that relationship between the hydrological characteristics of the Yellow River and the renewed-land amplification was most significant(significant check is more than 0.01 level.),the relation could be expressed as linear regression model.Findings also illustrated that there was a equilibrium point while runoff reached 135.32×108m3,the amount of sediment discharged was 3.517×108t,and the carrying capacity was 19.64kg/m3,all relating to the hydrological characteristics of the Yellow River.