Abstract：The net photosynthetic rate (NPR) and carbon fixation and oxygen release capability (CFORC) of 12 ornamental bamboo species in different months were compared and analyzed. The results show that the NPR of different bamboo species was significantly different in different month with the change trend of July > August > June > May > April; the species with maximum NPR was Indocalamus latifolius, while the species with minimum NPR was Sinobambusa tootsik. The CFORC of the same bamboo species was significantly different in different month, and the CFORC change trend of 12 ornament bamboo species in terms of per unit leaf area and per unit land area was July > August > June > May > April; the CFORC of per unit leaf area and per unit land area of different bamboo species were significantly different in the same month, and the species with the maximum CFORC of per unit leaf area was I. latifolius while the minimum was S. tootsik; the species with the maximum CFORC of per unit land area was Bambusa eutuldoides var. viridi-vittata, while the minimum was Phyllostachys aureosulcata. The CFORC of 12 ornamental bamboo species were classified into three types using cluster analysis, which for providing a theoretical basis of bamboo landscaping.