To ensure the fidelity of the ILS signal, the errors must be strictly controlled. The benchmark calibration flight precision control had very few attentions as the criterion. Therefore, through the computer to build a relatively complete set of airport simulation environment, we can design a control system and intuitive way to monitor the signal used to get rid of a variety of factors lead to errors. This showed the calibration results were unstable. The insightful significance is that this provides a guideline for the visualization and conformity of complex electromagnetic environment.