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This paper investigates the vibration characteristics of a double-overhung rub rotor considering gyroscopic couples and slanting contact between rotors and stators. This paper deduces a new contact model according to slant contact between rotor and stator, which close to real rub condition, and compared with simple contact model.With rotating speed and support span changing, the dynamic behaviors of rotors are simulated by the fourth Runge-Kutta method. The results illustrate that gyroscopic couples and slant contact model can lead to rub occurrence at a lower speed compared with no gyroscopic couples or slant contact. Resonance has a huge effect on radial displacement and frequency spectrum of disk, and in resonance interval the frequency components are complex. At the same rotating speed, support span has a monotonous effect on amplitude of radial displacement. These results might provide some reference to estimate whether rubbing occurs and help to control rubbing force.