Abstract: A hydroponics experiment was conducted to study the effects of five cutting intensities of Carex dispalata (the remained stubble height = 10 cm, C₁; 20 cm, C₂; 30 cm, C₃; 50 cm, C₄; and no cutting, C₅) on the growth of C. dispalata and its sewage purification efficiency. Cutting could promote the regeneration ability of C. dispalata. In C₂, the plant growth rate in 1-7 days after cutting reached 3.67 cm·d^-1, far greater than that in C₅. The cumulative biomass varied among the treatments, showing a trend of C₂ > C₃ > C₁ > C₄ > C₅. Cutting increased the removal rates of sewage N and P by C. dispalata. Treatment C₂ showed the highest removal rates of sewage TN, NH₃-N, TP, and COD_cr. A remained stubble height of 20-30 cm was the optimal cutting intensity of C. dispalata