In this study, LI-6400XT portable photosynthesis test system was employed to observe physiological indicators of 8 widely used species of Sha river's plant corridor in Chengdu. Furthermore, the carbon sequestration, oxygen release capacity, cooling and humidification effects were also evaluated. Our results indicated: The capacity of carbon sequestration, oxygen release, cooling and humidification effect per unit of leaf area was in the order of summer > autumn > spring. The order of daily carbon sequestration and oxygen release capability per unit of leaf area from strong to weak was O. fragrans,S. babylonica, C. camphora, F. virens, E. sylvestris, G. biloba, C. pedunculatum and M. glyptostroboides; and the order of annual carbon sequestration and oxygen release capability per unit of leaf area from strong to weak was S. babylonica, C. camphora, F. virens, G. biloba, O. fragrans, C. pedunculatum, M. glyptostroboides and E. sylvestris. The capabilities of daily cooling and humidification effect per unit leaf area of the trees pecies from strong to weak was S. babylonica, E. sylvestris, M. glyptostroboides, C. pedunculatum, F. virens, C. camphora, G. biloba and O. fragrans. It was estimated that the total amount of annual carbon sequestration of trees in Sha river was about 5.87×10⁴ t and the oxygen release was about 4.27×10⁴ t. Based on the above analysis of the main tree species, it was suggested that S. babylonica, O. fragrans, E. sylvestris, and C. camphora should be taken as the priority tree species. Due to the weak C sequestration oxygen release and cooling and humidification effect, G. biloba should not be virescenced in a large area, but could be used as a longevous and ornamental tree species.