Abstract: This paper briefly analyzes the requirements of underwater archaeology for underwater vehicles,and explains the feasibility of SPC-II robofish to perform underwater task from the point of view of its velocity,maneuverability,comparison with UUV(Unmanned Underwater Vehicle),etc.A scheme for underwater archaeology assisted by SPC-II and based on hovering dive is presented.Experiments validate this scheme.The scheme resolves the problem of SPC-II's lack of dynamic positioning and supplies reference to future research.