This review focuses on the hydrological definition and functions of hyporheic zone which has a feature of interaction between surface water and groundwater in natural stream system. This work also investigated how to measure the amount of flow exchange around this zone. As hyporheic zone shows heterogeneous feature due to groundwater level, river bed thickness, and hydraulic conductivity, spatio-temporal variation of interactions between surface-groundwater hydrologic exchange is to be analyzed. The methods to quantify this flow exchange can be classified according to field scale and status, the proper method should be adopted. Especially, Krause et al. (2007), showed that the flow exchange plays an important role in water balance in watershed and can be quantified by using integrated watershed hydrologic modeling.