[en] Absorption of UO₂²⁺ from dilute solution by anabaena azollae is completed within 2 minutes. The optimum pH is among 5-8.5, which suggested that [UO₂OH]⁺ is the major form to be bound by anabaena azollae. Li⁺, Na⁺ K⁺ and NH₄⁺ or F^-, Cl^-, SO₄^2- and NO₃^- have not obvious effect on the absorption of uranium. Cu²⁺, Cd²⁺, Mn²⁺ and Zn²⁺ decreased the absorption capacity of uranium by anabaena azollae. Fresh cells of 3.5-4.5 g/L (in dry weight) is able to attenuate uranium in simulated wastewater from 5.5 mg/L to 0.05 mg/L after 4-7 serial experiments