ABSTRACT
The most important qualification of aviation at flight altitude over tenthousand feet and sub aquatic seafaring [in all deeps] are the effective oxygen production instruments which have the worthwhile role in prevention of hypoxia and hyperventilation. These systems were used invention in First World War and greatly improved since this century. Informed about this systems and their introduction, function and probable failures are very necessary. This study documents collected based on any books, articles and knowledge about marine. Oxygen generator systems produce this gas as a shape of gas, liquid and chemical compounds. All the oxygen generators consist of two major sources: main source and back up source which help on emergency situations. Function of this system was based on two methods: automatic and manual operation. Relative appurtenants such as connecting pips, regulators, air dilution systems and masks have accurate points depend on their facilities. Best part of their functions are air dilution ability, generation of 100% oxygen, positive pressure breathing and suitable oxygen temperature. Progressive development of aviation and seafaring technology and up to date investigations implicate enough flight and sea crew orientation about oxygen and its equipments for hypoxia and hyperventilation prevention