4-FERMI EFFECTIVE OPERATORS AT E(-)-](T)OVER-BAR-T()E()

The process of top quark pair production at Next Linear Collider (NLC) has been considered adopting an effective Lagrangian approach and inc luding all operators of dim 6 which can be tree-level-generated within unknown underlying theory. All contributing helicity amplitudes are p resented. It has been found that four-fermion operators can provide th e leading non-standard contribution to the total cross section. Expect ed statistical significance of the non-standard signal for the total c ross section and forward-backward asymmetry have been calculated takin g into account existing experimental constraints. It has been shown th at adopting realistic luminosity of NLC and conservative efficiency fo r the top-quark pair detection, the total cross section may be sensiti ve to non-standard physics of an energy scale around Delta = 5 TeV.