The extreme cold conditions in polar environments pose significant challenges to ship navigation, particularly with frost and fog condensation on the windshield surface. Frost and fog not only affect visibility for drivers but also pose safety hazards. Using Ansys software, the dynamic processes of frost and fog transmission and condensation on glass surfaces during polar ship navigation are explored. Controlling the ventilation system to increase the temperature of the inner wall of the glass is the safest and most widely used demisting method. It is very meaningful to study the demisting performance of different air supply methods. The research results indicate that under both air supply methods, the entire wall surface temperature is lower than the dew point temperature, and frost appears when the temperature around the glass perimeter drops below 0 °C. Using rain-type ventilation with nozzles placed on the windowsill can dissipate the fog within 3 min. These findings provide insights for the design of polar ship bridges, enhancing their usability.