Abstract: Hydrothermal deposits usually contain some information about hydrothermal activities, and their geochemical characteristics can indicate material sources of deposits. This study took sediment samples from the Longqi hydrothermal area and surrounding areas as the research object, and discussed the material sources of sediments and the hydrothermal contributions from elements in hydrothermal sediments by using element compositions. The results showed that the sediments in the study area were mainly calcareous biogenic sediments and detrital sediments. The contents of TFe₂O₃, MnO, P₂O₅, Ni, Cr, V and Cu in the detritus sediments were higher than those in the calcareous biogenic sediments. The total amount of rare earth elements of the sediments was generally low, showing the characteristics of light rare earth enrichment, negative Eu and Ce anomalies. The main sources of sediment materials are calcareous biogenic, pyroclastic, hydrothermal components and seawater. In the detrital sediments, the hydrothermal contributions of different samples were different. The main elements of the sediment samples affected by the hydrothermal zone were Fe and Mn.