The aim of this research is to improve the biomass productivity of chlorella vulgaris FACHB-1072 biomass in the Capillary Action Microalgae Attached Cultivate System.Experiments were performed using the Central Composite Design (CCD) parameters in Response Surface Methodology (RSM). Results showed that the quadratic regression equation of microbial biomass yield, the correlation coefficient of the model was more than 97%. The optimum combination of productivity conditions are: CO₂ flow rate 0.04L/min, Culture Period 124.86 h, light dilution area ratio(R_AD) of 1.33. Under this condition, the productivity of C. vulgaris reached 34.81 g/m²/day.At the same time, the Total Nitrogen (TN )removal rate reached 95.64%, which played a very good sewage treatment effect.