Abstract：Research purposes： Communication Junction has intensive people and it is very possible to be attacked，so it is necessary to proceed progressive collapse analysis. To study the progressive collapse process of structures, a method to apply instantaneous load was adopted to simulate the progressive collapse of a station with a failed middle column at the first story by using the large deformation and dynamic finite element software LS -DYNA. Two cases of single - column failure and one case of double - columns failure were analyzed employing alternative path method according to the requirements of UFC 4 -023 -03. Research conclusions ： (1) This station is locally damaged for single - column failure cases, but the damage is confined within the limited area around the removed member. (2) For the double - columns failure case， the damaged area is obviously increased, but it is still confined in a limited area and will not induce the whole structure. (3 )The progressive collapse resisting capacity of steel structures can be remarkably improved by increasing the failure strain of the structural material. The structure has strong ability to resist progressive collapse. (4 ) The research results can provide a simple measure to evaluate the safety performance for such structure.