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-IIs lack of dynamic positioning and supplies reference to future research.