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We have studied the measurement accuracy of the forward-backward asymmetry ofthe $e^+e^- \rightarrow t\bar{t}$ process in the 6-jet mode at $\sqrt{s} = 500$GeV with the ILD detector. In the analysis the vertex charges of b-jets wereused to distinguish t from $\bar{t}$ in each event. The distribution of thecosine of the reconstructed polar angle of so identified t or $\bar{t}$ showeda clear forward-backward asymmetry. After the correction for chargemisidentification the forward-backward asymmetry was determined to be $A^t_{FB}= 0.334 \pm 0.0079$ for 500 fb$^{-1}$ with the beam polarization combination of$P(e^+, e^-) = (+30\%, -80\%)$, demonstrating a very good statistical accuracy($\sim 2\%$) even in the 6-jet mode.

Feasibility study of the forward-backward asymmetry of the e+e- -> t  tbar process in all-hadronic decay modes at sqrt(s) = 500 GeV with the ILD  detector