Environmental change mainly refers to the climate change(fluctuations) and the human activities in the basin.Runoff is the result of influence of climate factors such as precipitation,temperature,etc and human activities on basin runoff yield and concentration.This paper reviewed all aspects of quantitative analysis of climate change and human activities on runoff,such as the research approach,the determined method of datum period,reduction method of runoff,various models used recently.Finally,it summarized...