We carried out the experiments of the influence of some ceilings of the multiple dwelling houses on heavy-weight floor impact sound in the experimental room. This paper mentions the results of the experiment. According to the results, we acquired useful information for the acoustical design of the ceiling of the multiple dwelling houses. For example, the thickness of the air layer between the ceiling and the concrete slab has much influence on heavy-weight floor impact sound level. Furthermore, the interval of the hang bolts of the ceiling also has much influence on that.