Abstract: The effect of simulated acid rain pH(2.5, 4.5) on chlorophyll fluorescence was investigated with four woody plants which were collected from Dinghu Mountain (Schima superba, Castanopsis fissa, Acmena acuminatissima and Cryptocarya concinna). As the results indicated,no visible damage appearedon on detached leaves treated with pH 4.5 simulated acid rain for 7 d and their Fv/Fm did not change significantly; visible damage appeared on detached leaves treated with pH 2.5 simulated acid rain for 7 d, with the damage of Cryptocarya concinna leaves being less severe than that of the other three woody plants' leaves. The results of PSII F_v/F_m fluorescence imaging showed that PSII of Cryptocarya concinna was less severely damaged than that of the others. Meanwhile, ETRII of Cryptocarya concinna, treated with simulated acid rain of pH 2.5 and pH 4.5, was significantly reduced, and the cyclic electron flow of PSI was excited. The results indicated that Cryptocarya concinna had higher acid resistance than the other three woody plants, suggesting that the strong acid deposition might lead to the advantage of Cryptocarya concinna in the subtropical forest communities.