[en] We present the complete calculations of the forward-backward asymmetry (A_FB) and the total cross section of top quark pair production induced by dimension-six four quark operators at the Tevatron up to O(α_s²/Λ²). Our results show that next-to-leading order QCD corrections can change A_FB and the total cross section by about 10%. Moreover, next-to-leading order QCD corrections reduce the dependence of A_FB and total cross section on the renormalization and factorization scales significantly. We also evaluate the total cross section and the charge asymmetry (A_C) induced by these operators at the Large Hadron Collider (LHC) up to O(α_s²/Λ²), for the parameter space allowed by the Tevatron data. We find that the value of A_C induced by these operators is much larger than standard model prediction, and LHC has potential to discover these new physics effects when the measurement precision increases.