Extreme precipitation events occur rarely and are difficult to collect samples. There are still uncertainty problems with the definition of extreme precipitation threshold

which is variable and not unified. This study summarizes the uncertainties of extreme precipitation threshold based on Fixed Critical Value Method

Special Percentile Value Method and the Goodness of Extreme Value Distribution Fitting Test. In order to overcome these problems

a new method

named as DFA

has been used to discuss the physical mechanism and applicable conditions. The system dynamics-based DFA

tracks extreme precipitation threshold by analyzing the characteristics of long range correlation of the precipitation series and can well reflect the statistical effects and scientific background of precipitation series.It is applicable to define extreme precipitation threshold within a basin.