In many LNG vaporizing and receiving stations, fogging generated from ambient air vaporizers is a big hidden trouble seriously affecting safe production. So, in this study, fogging phenomenon was analyzed, and two fog-dispersal methods were proposed. Moreover, taking ambient air vaporizers in one LNG vaporizing station as examples, we carried out numerical simulation on normal fogging process and thee two methods by means of fluid dynamics. Results show that (1) massive white fog may be generated all around if vaporizers are in good order; (2) substantial white fog may be accumulated in exhausting side even using base-bleed approach decreases fog amount in another side, resulting in unobvious fog-dispersal effect; and (3) to keep air convection at the top may greatly not only increase temperature after air heat exchange but also decrease fog-generating area in order to obtain better fog-dispersal effect.