The purpose of this study is to clarify the basic characteristics of the fire smoke movement in the space of low ceiling and large floor. Authors carried out the tests about the fire smoke movement of fire source with large-sized full scale real room. The main findings are as follows; 1) the smoke layer is moved about 107 meters from the fire source and it spreads to about 3,190 square meters in case of small fire source, 2) the layer of smoke is formed in the upper space and the layer of air is formed in the lower space.
