Currently, transparent ceilings are commonly employed in subway stations. Compared with other types of ceilings, in the event of a fire, a portion of the smoke will penetrate into the ceiling interior through the pores of the ceiling grilles, exerting a certain influence on smoke diffusion. To investigate the impact of grid ceilings on smoke diffusion and passenger evacuation, this project focuses on Shenyang Aerospace University Subway Station. The Pyrosim software is utilized to simulate the entire process of fire development on the platform level. This study compares the effects of three distinct ceiling configurations - closed ceilings, open ceilings (no ceiling), and transparent ceilings - on the pattern of fire smoke dispersion. For Grid ceiling, an analysis is conducted on the temperature distribution of fire smoke and the visibility within the fire zone under scenarios where the perforation rates are 25%, 33%, 50%, 67%, and 80%. The findings indicate that the smoke storage space created by transparent ceilings can slow down the spread of smoke on the platform level during the initial stage of a fire, facilitating the containment of high-temperature smoke at a safe altitude. As the perforation rate increases, the resistance of the grid ceiling to the plume movement of smoke weakens, and the downward movement of high-temperature smoke becomes more pronounced. In comparison to closed ceilings, grid ceilings significantly enhance the visibility on the platform level, providing advantageous conditions for passenger evacuation. However, variations in the perforation rate do not have a significant impact on smoke visibility.