We investigated the multielectron ionization dynamics of C2H2 subjected to intense few-cycle laser fields with time-dependent Hartree-Fock(TDHF) approach, in which one-center method has been employed with the finite element discrete-variable representation(FE-DVR) and B-splines.It is found that there exists "inner-orbital resonant enhancing ionization" phenomena if the photon energy is close to the energy gap between the two inner orbitals whose coupling is becoming stronger with increasing laser intensities.