The ecological benefits of five common species usually applied in roof garden were studied in this paper. Photosynthetic rate, dust detaining, sulfur and chloride absorption capability were analyzied and assessed for their ecological benefit comprehensively. The results showed, among the 5 species, Rhoeo discolor prefered shade environment and had good tolerance of the sunlight; Wedelia trilobata and Melastoma dodecandrum presented higher net photosynthetic rates of 4.40 and 3.46 μmol[DK]·m-2·s-1, respectively, and both species also had a great function in oxygen production; Lantana camara exhibited the best annual dust detaining rate which was up to 692.47 gm-2; Arachis duranensis performed the best sulfur and chloride absorbtion capability, the annual absorbing rates for sulfur and chloride were 0.521 9 and 0.372 4 g-2 , respectively. The ecological benefits of the five species was ranked successively as W. trilobata, L. camara, A. duranensis, R. discolor and M. dodecandrum.
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