Abstract: This study investigates a specific water ejection cabin door model, integrating its functional characteristics and load environment to conduct systematic multi-condition load analysis and static strength evaluation. Traditional empirical methods struggle to accurately assess stress distributions under complex load combinations. This study establishes a refined finite element model and integrates multi-condition load data such as flight aerodynamic load, landing water load, water drop load and gravity load to simulate the stress response and deformation characteristics of the cabin door under extreme conditions. Analysis reveals that the maximum equivalent stress on the cabin door under the above loads is 75% of the material's yield strength, with overall deformation within design thresholds. This validates the rationality of the existing structural design and provides theoretical support for the engineering development and safety verification of firefighting aircraft water ejection cabin doors.