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Compartment fire smoke movement in an adjoining six-storey stairwell and its dynamics behavior are investigated using the Fire Dynamics Simulator (Version 4.07). Smoke temperature and velocity field are analyzed. Longitudinal distribution interior pressure in stairwell is researched, and location of neutral plane is also surveyed. It is found that smoke temperature decreases distinctly with the height in stairwell, yet the maximum temperature does not exist in the lower grand-level due to air supply. The neutral plane ascended with time and the relation of interior pressure with height fit logarithm well. And meanwhile, the heat release rate has obvious effect on distributions of smoke temperature and velocity. The maximal smoke temperature in stairwell ranged from 87.6oC to 130.3oC under HRR from 500 kW to 1000 kW respectively.