Abstract: In order to study and reduce the impact noise generated while hitting floor structure, the idea expressing the impact noise received at a point in the space as the superposition of all orders of vibration modes is used. If a certain vibration mode is suppressed or not excited, the radiation noise at the corresponding frequency can be reduced and eliminated. The experimental study is carried out by laying a soft surface layer on the surface of floor structure and hitting it with a standard impactor, and the results show that the normalized impact noise level can be effectively reduced. This is because when the excitation force is insufficient to excite higher-order vibration modes with increasing frequency, the floor structure does not radiate the impact noise corresponding to the model frequency, therefore the purpose of noise reduction can be achieved.