The requirement on sound insulation of living environment is becoming higher along with the living standards improves.Japanese made much research on improving the sound insulation of dwelling house and got much progress in the last few years.This paper briefly introduces some Japanese research results on sound insulation of floor impact noise that is difficult to insulate.Though the national conditions between Japan and China are quite different,in Japan the dominant dwelling houses are wooden construction,but the results still have some reference worth to improving the sound insulation of concrete construction dwelling house.