Abstract: Hot smoke buoyancy has a greater influence on movement law of fire smoke in a shaft structure of high-rise (super high-rise) buildings.This paper respectively tests the processes of change in temperature at different heights of shaft at different times under different ignition source power conditions using a research approach integrated with field experiments, theoretical analysis and field simulation and setting eight different fire scenes, and finally summarizes the movement law of smoke in the shaft structure under mere hot smoke buoyancy, in order to provide theoretical basis and practical guidance in actual fire prevention design and evacuation of high-rise buildings.