In the actual design of civil aircraft, fire protection design is a key research direction for aircraft. Fire is a frequent type of aviation accident, and it is not possible to establish a corresponding risk model to quantitatively assess the hazards to the systems and structures in the relevant zone after its occurrence. This paper proposes a simple and easy-to-use fire specific risk analysis method based on the guidelines for fire safety analysis of flammable liquids given in the FAA Advisory Circular. The fire specific risk analysis process was established, the principle of fire protection zones division and the idea of fire specific risk analysis were introduced, and finally a civil aircraft model was used as an example to further illustrate the application of the fire-specific risk analysis method, which is suitable for the positive design of civil aircraft fire safety.