In view of the low maneuverability of submarines and the weak concealment of traditional surface attack speedboats,a design concept of midget hydrofoil penetrating submarine,which realizes advantageous complementarities of these two naval vessels and trumpets their strengths,is elaborated in this paper. This paper analyzes this concept from the aspects of design concept,structure layout and application research,studies the use,development value and potential military tactical application of the midget hydrofoil penetration submarine,and points out the problems that can be improved in the current design.