Abstract: Using soil and weathered sand as matrix, two northern broadleaved annual seedlings Acer ginnala and Acer mono were potted to study the influence of soil Pb pollution on photosynthesis and chlorophyll fluorescence characteristics in leaves of seedlings by designing 5 kinds of Pb2+ concentration (0, 100, 500, 1 000, 2 000 mg/kg). The result showed with increasing concentration of soil Pb2+, for Acer ginnala, Pn declined continuously and Tr, Gs and Ci first increased and then decreased and for Acer mono, Pn first increased and then decreased, Tr and Gs declined continuously and Ci increased continuously. With increasing Pb2+ concentrations in soil, Fv/Fm and Fv/Fo first increased and then decreased, qP and ФPSⅡ declined continuously for two trees, qN first increased and then decreased for Acer ginnala. In Pb2+ concentrations greater than 500 mg/kg, stomatal and non-stomatal limitations together caused Pn declining for Acer ginnala and non-stomatal limitation caused Pn declining for Acer mono; the chlorophyll fluorescence parameters were not significantly related to photosynthetic rate for two trees and in Pb2+ concentrations less than 1 000 mg/kg, growth of two trees was not significantly effected. So the two trees could be applied to the present city with Pb pollution for green area construction.