In construction engineering,the traditional sound insulation technology of floating construction method mainly relies on the combination of sound insulation cushion and extruded board.Through the design,production and construction technology of the new sound insulation mortar,the construction principle,operation points,quality and safety,labor force,material,equipment configuration and other aspects of the indoor building floor sound insulation mortar are discussed and analyzed.At the same time,the application benefit of the new sound insulation mortar in the construction engineering example is also analyzed.Taking Foshan Xingtan Qixing Biguiyuan project as a case,this paper discusses in detail from four aspects:project overview,construction status,project evaluation and benefits brought.Through the implementation of this process,it will effectively reduce the impact of the residents and improve the comfort of the residents.