When high speed vessels are discussused, one may usually think of dynamically supported vessels such as hydrofoil crafts, hovercrafts, etc. These types of vessel, however, have restrictions in terms of deadweight and cruising range. In order to clear these restrictions, the concept of displacement type monohull vessel suitable for high speed navigation has been investigated. This paper presents the outlines of its conceptual design of about 10, 000 M. T. displacement calss. This paper also discusses design problems and countermeasures regarding resistance, propulsive performance, sea worthiness, maneuverability, hull strength, propulsive machineries, etc. related to this design concept.