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We report the simulation of femtosecond three-pulse photon echo phenomenon induced by the optical transition of 1 Se1 Sh exciton in a core-shell CdSe/ZnS nanocrystal quantum dot (NQD).The parameter dependence of the photon echo signals has been investigated employing the optical Bloch equations.The numerical results reveal that the photon echo signals are sensitive to the variation of the size and structure of NQD.And the NQDs size and structure was optimized for the three-pulse photon echo phenomenon based on the analyses of the calculation results.Particularly,the related parameters of the optical properties,such as the electric transition dipole moment,the energy interval and the relaxation time,have been calculated as the NQDs size and structure changed,and the corresponding mechanism has been discussed in terms of the quantum size confined effect theory.