Abstract: As for key supporting technologies,studies on coordination between economic development and ecology conservation have attracted extensive attention in the assessment of ecosystem functions and ecosystem services.The study is especially relevant to the issues of water quality degradation and the deterioration of ecosystem functioning.In this study,certain hot issues on the subject including function identification,assessment method and driving mecha-nism are addressed.The concept of water ecosystem services in its broad and narrow sense is discussed.As the result,a board and narrow sense concept in water ecosystem service,the double-function identification method and research models are proposed.The study also reviews key supporting technologies for the subject including observational prototype technologies,coupled eco-hydrological models,and multidimensional analyses.The study highlights the major shortcomings of current research,e.g.,weak connotation and function identification,imperfect assessment methods,untapped key supported technologies,and unsatisfactory results from technology application.Finally,the future prospects for the subject are presented.