For transport category airplanes, postcrash fire is one of the important problems to be considered for cabin safety. The time for evacuation that delaying fire or flame into cabin, namely fuselage burnthrough resistance should be ensured. In this paper, the characteristics of postcrash fire, including the range of temperature, heat flux and influence factors are introduced, the process of fuselage burnthrough, accounting for the criterion of airworthiness regulation on fuselage burnthrough resistance are analyzed, the development of method of compliance to determine the burnthrough resistance is stated, and development tendency of fuselage burnthrough resistance in future is expected.