The evolution of river landscape is comprehensively influenced of various factors, such as bedrock lithology, sediment supply, tectonic activities, vegatation and climate changes. An increasing number of studies suggested that damming incidents occurred on the stream channel are capable of significantly modifing the morphology of longitudinal profiles of river display. For example, knickpoints formed by repeatedly river damming during the glacial and interglacial periods could retard headward erosion along the river channel, which play a critical role in maintaining the integrity of the Tibetan Plateau. However, previous studies rarely take this into account when geomorphologic analyses were carried out using quantitative morphological parameters of the river longitudinal profile. The influences of river damming on the evolution of river longitudinal profiles are mainly reflected as follows. Firstly,the dams would rise the local base level of erosion,resulting in upstream aggradation,enlargement of valley width. In addition, the dams would act as a river knickpoint to retard the regressive erosion towards upstream channel. A forementioned influences primarily depends on the height and duration of the dams blocking. Lastly, the dam failures usually trigger flood of great magnitude causing severe downstream erosion of and longitudinal profile of river adjusts itself to equilibrium until the knickpoint vanish due to the focused downward erosion at the dam body. This process would promote river erosion,which mainly depends on the magnitude,frequency, and occurring time of outburst floods. Extreme events such as river damming and outburst floods are important processes for channel aggradation and erosion of rivers. However, an adequate understanding of their impacts on the evolution of river geomorphology is lacking in China. Hence, we conduct a brief overview of studies on river-damming and its influences on river geomorphology in this paper, taking related researches in southern New Zealand and Swiss Alps, the edge of the Tibetan Plateau, eastern Oregon and western Turkey as examples. To date, studies on responses of river system to damming incidents have only be carried out based on the spatial correlation between dams and knickpoints of the river. In oder to quantify the geomorphic effect of the river damming, it is necessary to obtain the detailed parameters of magnitude, frequency and time of duration of the river dammingand consequent outburst floods.