The ground-airborne frequency-domain electromagnetic (GAFDEM) survey is a fast method to detect the deep underground structure in areas with difficult access. However, the suspended coil sensor in the survey system experiences attitude changes, which inevitably yield attitude error on the measured magnetic field and result in false apparent resistivity imaging. Due to the separated system structure, the attitude error in GAFDEM survey is significantly different from that in traditional airborne helicopter frequency-domain electromagnetic survey. In order to improve the detection accuracy, a modified iterative algorithm is proposed to suppress the attitude error for apparent resistivity imaging. Both simulation and practical experiment are conducted to verify the usefulness of the correction method. The simulation results indicate that the correction procedure is important and effective to reduce the attitude error in layered earth model. The field experiment results show that the corrected apparent resistivity imaging section is more consistent with the high-density resistivity topography and more reasonable than the uncorrected apparent resistivity imaging result obtained by conventional method. Consequently, the proposed suppression approach can reduce the attitude error to obtain more accurate apparent resistivity imaging results in GAFDEM survey, which may effectively promote the developments and applications of GAFDEM method and systems.