Abstract: The ecological revetment engineering can protect river ecosystem health well,and is used widely in the channel revetment.The flexible vegetation is a main kind of engineering materials in the ecological revetment engineering,because it grows quickly and can be easily planted and constructed.In this study,36 samples of turf and reinforced turf were tested,and the vegetation's hydraulic roughness was calculated.The experiment proves that the hydraulic roughness of the turf used in revetment ranges from 0.020 to 0.090.The roughness depends on the different categories of soil,period of growth and way of reinforcement.The data proves that the roughness of reinforced turf is higher than the turf generally.