Based on the technique of Time Correlated Single Photon Counting(TCSPC),energy transfer kinetics among chlorophylls in a monomeroic unit of major light-harvesting complex (LHC Ⅱ) from bryopsis corriculan were studied. In the chlorophyll Q region,six characteristic molecules marked as Chlb₆₃₀,Chlb₆₄₂,Chla(653,652),Chla(667,664),Chla(676,680,675),Chla(683,682) were discriminated. Fluorescence kinetics measured in the chlorophyll Q region was excited by pulsed light of 630 nm(70 fs). After analyzing,results of energy transfer among chls were obtained as following: only～20% of the energy absorbed by Chlb₆₃₀ is initially transferred directly to other Chls with time constants shorter than 150 fs. Overwhelming part of the energy transfer among chlorophylls occur with time constants longer than 76 ps. Energy transfer pathway with time constants of several hundred femotoseconds and tens of picoseconds were also obtained. The fluorescence lifetimes of Chlb(653,652),Chla(667,664),Chla(676,680,675),Chla(683,682) were determined to be 1.41 ns,1.39 ns,676 ps,709 ps respectively. The percentages of energy dissipation in the pathway of fluorescence emission are no more than 40% in the monomeric unit of LHC Ⅱ.