25.785(b)(d) requires that transport category aircraft be designed to protect occupants from serious injury when subjected to emergency landing inertial forces. Based on the study of the relevant advisory circular and certification policy memorandum of FAA, combined with the compliance verification practice, this paper has completed the analysis of the requirements of 25.785(b)(d) and sorted out of the consideration of compliance verification of 25.785(b)(d), and formed the means of compliance of 25.785(b)(d). It can be used as a reference for the design and compliance verification of transport category aircraft with respect to 25.785(b)(d).