Abstract: In general, nutrients (nitrogen and phosphorus) in reclaimed water may cause harmful algal blooms in the process of reuse. Filamentous algae can convert nutrients in reclaimed water into biological resources such as protein and lipid, which can effectively reduce the incidence of harmful algal blooms in the process of reclaimed water reuse. Light intensity can affect the growth of filamentous algae and the content of the intracellular substances, thus affecting the removal of nitrogen and phosphorus in reclaimed water. To investigate the effects of different light intensity on the growth of filamentous algae and the removal efficiency of nitrogen and phosphorus from reclaimed water, four filamentous algae (Spirogyra sp., Oedogonium nodulosum, Ulothrix sp., and Mougeotia sp.) were selected. The filamentous algae were cultured in laboratory-formulated recycled water at different light intensities (0, 2,000, 6,000, 8,000, 10,000 lx), and the growth of filamentous algae and the changes of N and P content in the recycled water were monitored at different light intensities. When the light intensity was 8,000 lx, the results showed that the highest TN removal rates of Spirogyra sp., Oedogonium nodulosum, Ulothrix sp., and Mougeotia sp. were 48.33%, 64.87%, 49.74% and 79.32%, respectively. TP removal was low by Spirogyra sp. at light intensity of 2,000, 6,000 lx and by Ulothrix sp. at 2,000 lx. The TP removal reached more than 90% under other conditions. The saturated light intensities for Spirogyra sp., Oedogonium nodulosum, and Ulothrix sp. were all 8,000 lx, the biomass yield, protein content and lipid content were the highest, and the saturated light intensities for Mougeotia sp. were between 8,000 and 10,000 lx. The protein content of filamentous algae cultured in reclaimed water was higher than lipid. The study showed that the Mougeotia sp. was more suitable for the removal of N and P in reclaimed water.