  We demonstrate a way to polarize and detect nuclear spin in a gate-defined
quantum point contact operating at high Landau levels. Resistively-detected
Nuclear Magnetic Resonance (RDNMR) can be achieved up to the $5$th Landau level
and at a magnetic field lower than $1$ T. We are able to retain the RDNMR
signals in a condition where the spin degeneracy of the first 1D subband is
still preserved. Furthermore, the effects of orbital motion on the first 1D
subband can be made smaller than those due to electrostatic confinement. This
developed RDNMR technique is a promising means to study electronic states in a
quantum point contact near zero magnetic field.
