Abstract: In order to improve the heat transfer effect of steam film condensation outside the heat exchange tube of vacuum phase-change heating furnace, the micro-vibration excitation is introduced to break the force balance of condensate film on the external surface of the heat exchange tube so as to promote the quick detaching of liquid film. In this paper, the dynamic characteristics of the liquid film detaching from the external surface of single circular tube under the effect of simple harmonic oscillation were simulated by using the dynamic grid software FLUENT. Then, the effects of the vibration parameters on the coverage rate of liquid film around the tube were analyzed. It is indicated that the vibrating circular tube is superior to the still circular tube, for its boundary layer is thinner with stronger vibration and the alternative oblique bypass appears, strengthening the damage to the liquid film. The vibration also accelerates dramatically the detaching of liquid film condensed on the external surface. After micro-vibration is applied to the liquid film condensed on the external surface of tube, the liquid film breaching time is much shorter than that (i.e., 106 ms) in the static state. Furthermore, the time efficiency of the detaching of condensate liquid film is increased with the increase of vibration amplitude and frequency. In conclusion, the application of the research results can improve the heating efficiency of vacuum phase-change heating furnace significantly.