Through artificial shading treatment,fast chlorophyll fluorescence induction dynamics characteristics of three-year old peach cultivar ‘Baojiahong’ leaves were studied under five different light intensities(100%,80%,60%,40% and 20% of full sunlight) at different growth periods.The result showed that:(1)with the decreasing of light intensity,the maximum fluorescence gradually increased.(2) In terms of PSⅡ energy distribution ratio,the value of φ_Eo increased significantly under the lower light intensity,but the value of φ_Do decreased.(3) In terms of PSⅡ reaction center activity,the values of ABS/RC,TRo/RC,ETo/RC,DIo/RC decreased significantly under the lower light intensity.(4) At all the 3 growth periods investigated in this study,diurnal variations of the maximum photochemical efficiency (F_v/F_m) decreased at noon under all the 5 light intensity treatments;and the higher light intensity was,the more F_v/F_m reduced.This result suggested that peach leaves had photoinhibition at noon.The present study revealed that,under low light intensity,the antenna pigment of peach leaves had the reduced fluxes of both absorption and trapped energy,and PSⅡ reaction center activity decreased,while the enhanced energy distribution ratio of electron transport could improve the light efficiency.