Steel frame structures are prone to failure of local load-bearing components under fire, and the progressive collapse could occur. Exploring the mechanism and law of progressive collapse of steel frame under fire is significant in design and reinforcement of steel structure, and to avoid progressive collapse under fire. In this paper, the analysis of the specimens of six story three-span plane steel frame of the bottom column and side column under fire after the failure of the remaining elements of progressive collapse process by ANSYS finite element software. The analysis results well simulated the whole progressive collapse process of the steel frame under the fire, then analyzed the change of structure and shape of the progressive collapse of the steel frame in every moment, which lay the foundation for the subsequent collapse analysis.
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