Using the model of multi-photon nonlinear Compton scattering, influences of the third-order dispersion under Compton scattering on the extra-short optical soliton self-frequency shifting were studied. The results show that the third-order dispersion under Compton scattering has the strong repressive effect on the extra-short optical soliton self-frequency shifting. There is a clearer modulation oscillating system of the soliton pulse in the time domain. The frequency spectrum is divided into two clearer and higher spectrum crests in the frequency domain. Self-frequency shifting ΔδT∝T－70Z5/2β4/53, but the coupling slope αT and slope α before the scattering are not the same.