<正>This paper deals with problems of electric power quality evaluation in ships' networks. These problems, like complexity of electromagnetic phenomena and their influence on electric devices as well as usually poor crew qualification in the field, have been recognized and commented on. Solution of the problems would be proposed in the form of new concept of the two stages of data processing and appropriate structure of electric power quality analyzer for ships' use and other isolated electric power systems as well. The considerations would be supplemented by the results of original research carried out in the real ship' s network by employees of Department of Ship Electrical Power Engineering of Gdynia Maritime University. The basis of the presented paper may be found in the authors' earlier work, among others in.