During last decade, studies on estuarine hydrology have been advanced greatly with the development of physical and mathematical models and the modernization of monitoring techniques of estuarine hydrological elements. This paper intends to introduce the progress of studies in the foreign countries on estuarine circulation, estuarine fronts, and the turbidity maximum in the estuarine regions, and evaluate three methods, i.e., Field observation, physical model and mathematical model ,and use the experience for reference to promote the stu-dies on estuarine hydrology suitable for the natural conditions of our country.
