For the safe design of the offshore plant, it is necessary to evaluate not only the marine environment of the offshore plant installation area but also extreme conditions such as fire and explosion. For the safe evacuation of crews in danger of fire and explosion, the offshore plant requires an exclusive escape facility. Passive Fire Protection (PFP) is widely used as one of such facilities. In order to realize the reasonable structural design of PFP, evaluation of structural strength based on offshore design code considering various loadings from fire, explosion marine environment. In this study, structural design was evaluated by using code check and heat transfer analysis to verify the structural design of PFP for an offshore plant that can be installed in the North Sea area. The three - dimensional finite element analysis model of PFP was created and the results of structural stress and deformation were derived using finite element analysis by applying the load conditions. The structural analysis results were evaluated for strength of all structural members of PFP by interfacing with code check program. Heat transfer analysis of PFP was carried out to investigate fire-proofing characteristics against fire accidents. The design integrity of PFP was evaluated from the results of strength evaluation and heat transfer characteristics of structural members.