Abstract: In order to investigate the re-greening effects of different compound iron fertilizers on the chlorosis in Bougainvillea, four different compound iron fertilizers were selected to carry out the experiment. And the four treatments included different combinations of ferrous sulfate, EDTA chelated iron, amino acid and urea. The chlorophyll content, chlorophyll fluorescence parameters, net photosynthetic rate related to photosynthetic characteristics and intercellular carbon dioxide concentration of deltamethrin leaves were determined. The results showed that the treatment of four different compound iron fertilizers could increase the chlorophyll content, maximum photochemical efficiency F_v/F_m and net photosynthetic rate P_n of Bougainvillea leaves. The re-greening effects of C4 (Fe-AA: 0.3% ferrous sulfate + 0.15% amino acid) treatment were the best.