Forested wetland plays an important role in regulating regional hydrological process, including flood storage, drought control and water purification. Previous researches on hydrology of freshwater forested wetland mainly focused on a single hydrologic process using traditional hydrologic methods, and few see these processes as a whole. Furthermore, the influence of these processes on rainfall interception has not been entirely quantified yet. The hydrogen and oxygen stable isotopes, natural tracers in water molecules, can comprehensively reflect and quantify the ability of vegetation and soil to intercept precipitation. This paper reviewed almost all the studies that involve the effects of forested wetland on hydrology process, and discussed the progress of hydrogen and oxygen stable isotopes technology in this field. Based on the stable isotopes technology, many hydrologic processes were explored, which include atmospheric precipitation, canopy throughfall, runoff, soil water, ground water, evaporable water, water source of plants and the conversion relationship among water bodies. Under the background of global climate change, using hydrogen and oxygen stable isotopes, the distribution proportion of hydrologic processes were systematically and quantitatively analysed, which is of great significance to reveal the response mechanism of forested wetland to the hydrologic process, and could provide scientific theory for freshwater wetland forest vegetation restoration model and protection strategy.