With the construction of high head and large flow discharge structure, the pulsating load caused by high-speed water flow has had a huge impact on the safety of the discharge structure, especially the discharge structure vibration problem induced by high-speed discharge is prominent. In this paper, fluctuating pressure spectral density characteristics on the sluice-dam discharge structure were analyzed and summarized. On the whole, spectral density of fluctuating pressure loads are mainly divided into four categories, and their variation corresponds to the flow and structure form. Fluctuating pressure spectral density of the sluice-dam discharge structure belongs to one or more of the four basic types. Through the analysis of the spectral density analysis of fluctuating pressure on the guide wall, gate and pier, all the spectral density of fluctuating pressure belongs to narrow band noise spectrum. The article can be used as reference in the similar water fluctuating pressure building research.