This study focuses on a ship compartment of a 5000-ton vessel. Utilizing the FDS fire simulation software, a combination of qualitative analysis and dynamic simulation is employed to investigate the progression of a fire incident in the ship compartment after implementing compartmentalization and firefighting measures. The study examines the development of the fire and the phenomenon of re-ignition. Various aspects, such as smoke diffusion patterns, temperature field variations, and CO concentration distributions, are analyzed to understand the changing environmental parameters during a fire incident on board a ship. The results demonstrate that the numerical simulation accurately portrays the re-ignition process within the compartment, providing a highly credible and reliable representation. These findings also serve as valuable references for fire assessment and ship design in the context of ship compartment fires.