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Hydrodynamic interaction performance between an unmanned underwater vehicle (UUV) and a submarine was presented using Reynolds Average Navier-Stokes (RANS) techniques, when submarine was recovering an UUV. The hydrodynamic characteristics of UUV in different positions relative to submarine was simulated numerically based on RANS techniques, and the variation of UUV’s hydrodynamic coefficients interfered by flow around the submarine was analyzed. Then combined with the dynamic grid techniques, unsteady hydrodynamic performance was numerically calculated when an UUV performed parallel movement and vertical movement relative to the longitudinal axis of the submarine, and the changing law of the hydrodynamic coefficients of UUV under corresponding conditions was revealed. The method presented could predict the maneuvering and controlling performance of the UUV retrieved to a submarine.