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The purpose of the study is for the stiffness pressing force of lightweight inner partition wall as long-life housing infill. And it has suggestion possibility of lightweight inner partition wall has secure the enough resistibility thought the mock up. The main thrust of lightweight inner partition wall’s variability. For secure the variability of lightweight inner partition wall, it needs to change the installation method of partition wall with upper and lower slab fixing method to floor and ceiling fixing method. Must be consideration of lightweight partition wall’s stiffness pressing force performance criteria if change the installation method. Mock Up test results of the study, specimen #1 and #2 gypsum board was not possible to reach the performance criteria 3000N. But specimen #3 ALC Block evaluated to have stiffness pressing force 1000N even 3000N, as well as performance criteria. Also, specimen #4 for the lightweight partition wall between housing is suitable with fireproof gypsum board.