Abstract: By using opentop chambers (OTCs) to simulate the scenes of elevated CO₂ concentrations \[500 μmol·mol^-1(T₁) and 700 μmol·mol^-1(T₂)\], and taking ambient atmospheric CO₂ concentration as the control (CK), this paper studied the effects of elevated CO₂ concentration on the lipid peroxidation and antioxidation enzyme system in Indocalamus decorus, Pleioblastus kongosanensis, and Sasa glabra leaves. After 103 days treatment, the O₂^-_· and MDA contents, relative electron conduction, and soluble sugar content in the three dwarf ornamental bamboo species leaves in T₁ had no obvious change, but the activities of antioxidation enzymes (SOD, POD, CAT, and APX) changed to a certain extent. In T₂, the MDA content and relative electron conduction had no obvious change, but the O₂^-_· and soluble sugar contents and the antioxidation enzymes activities changed obviously. The adaptation capacity of the three bamboo species to elevated CO₂ concentration was in the order of I. decorus > P.kongosanensis > S. glabra.