[Objective] In view of the controversies in baseflow separation theory and methods

the research progresse in baseflow separation was summarized in order to provide references for baseflow research.[Methods] We systematically reviewed the definitions of baseflow components

and the development of different baseflow separation methods

which include graphic analysis method

numerical simulation method

water balance method

isotope and chemistry method.[Results] We analyzed and evaluated the theoretical basis

advantages and disadvantages and conditions of application of above methods

and pointed out existing problems and future research trends.[Conclusion] So far

no method for baseflow separation is wide recognition. We still need to further strengthen the baseflow separation theory and method research

to form a unified and perfect theory system

and to determine the baseflow scientifically and reasonably. In addition

the change features and driving factors of baseflow will be an important part of the study of baseflow in the future.