Abstract: Bottom mud is an important source of release of ecological endogenous pollution of reservoirs. In order to comprehensively understand the content of heavy metals in the bottom mud of major reservoirs in Huangdao District, Shandong Province and its potential ecological hazards. In this paper, samples of 10 reservoirs, including Dijiahe Reservoir in Huangdao District, tested 10 heavy metal contents such as Hg, Cd, Pb, Cr, Cu, Zn, Ni, Fe, Mn and As in the sludge, analyzed the content and source of each element, and analyzed the degree of sediment pollution and potential Ecological risks are evaluated, and possible sources of heavy metals are analyzed. The results show that the Hg content of Xizhai Reservoir exceeds the standard requirements, the Cd content of Huagou Reservoir exceeds the standard requirements, and the content of the rest of heavy metals does not exceed the standard requirements. The degree of heavy metal pollution in the bottom mud of Huangdao Reservoir is from strong to weak: Hg＞Cd＞Zn＞Pb≥Cu≥As＞Ni≥Cr, and Hg and Cd are the most important heavy metal pollution elements. The potential ecological hazards of heavy metals are from strong to weak: Hg＞Cd＞As＞Pb＞Cu＞Cr＞Ni＞Zn. Hg and Cd are potential ecological hazard elements. Huagou Reservoir, Geely River Channel, Xizhai Reservoir and Dijiahe Reservoir, especially Xizhai Reservoir, have a serious degree of pollution. The main factors of reservoir pollution are mainly man-made factors, and the main sources are industrial sewage and domestic water discharge.