Blended wing body vehicle with its unique shape and mobility has become an important direction of future development of the ocean, but people do not know much about sailing characteristics of it. In this paper, semi-relative method is adopted to calculate the maneuvering characteristics of blended wing body vehicle, the main influence parameters are got based on dimensional analysis. The tail vortex will change with the rotation radius at in a horizontal turning at given speed. The asymmetric of vortex is greater when the rotating radius is small. The vortex separation position is same with the constant rotating radius. The maneuvering characteristics in vertical turning is better than in horizontal turing, which means than the blended wing body vehicle has more advantages in changing depth maneuver operation.