Due to the diversity of ecological characteristics and the complexity of flow movement,it is difficult to estimate the flow resistance in vegetated channels and to calculate the flood control capacity of ecological channels.Based on the review of flow resistance coefficient test and research result,we summarize the existing research methods,research contents and corresponding conclusions of vegetated channels,analyze the influential factors of the calculation methods of the resistance coefficient,and propose the technical approaches of vegetated channels model test to be improved.The mechanism investigation of flow resistance induced by vegetation should be strengthened by observing the turbulence characteristics in the vegetated layer.The study on the relationship between ecological characteristics of vegetation and flow resistance should be strengthened according to the vegetation characteristics of random growth and population distribution.The calculation methods of flow resistance under the combined action of vegetation and riverbed should be further optimized.