Transferring patients under critical conditions such as heart attack, stroke or transient ischemic attack (TIA), and head and backbones injuries is very important, specially transportation on sea because of high level of vibration of ship due to the sea waves is very critical. Many injured persons who work on ships or offshore platform with specialist hospitals are under critical dangers of their life because of their transportation with sea vehicles. In this paper a dynamic analysis is presented to investigate the effect of sea wave on the peak acceleration of critically seek persons during transporting them on a sea. With this information equipments can be designed and installed to transfer patients safer and healthier on sea.