Abstract: The anti-seepage of dam bodies has always been a key aspect in the design and construc⁃ tion of water conservancy projects. In the 1960s and 1970s，acidic reservoirs built in China generally adopted earth dams or crushed stone earth dams. Due to the limitations of technology and construction conditions at that time，anti-seepage geotextile membranes were not laid in the dam bodies and reservoir areas，and the quality of foundation treatment and filling of the dam bodies also did not meet the requirements，resulting in the dam bodies and dam foundations being prone to acidic water seepage. This has led to environmental pro⁃ tection incidents and safety accidents.The problem of dam leakage has gradually become an important issue affecting the economy，environment and people's livelihood around the acid reservoir area. This study takes the anti-seepage treatment project of an acidic reservoir in a certain mine as an example. Through engineer⁃ ing and hydrogeological investigation of the acid reservoir，the leakage conditions of the dam body，dam foun⁃ dation and dam shoulder of the acid reservoir were clarified，the leakage channels of the acid reservoir were mastered，and various anti-seepage treatment methods were compared and analyzed. Finally，the combined anti-seepage treatment scheme of high-pressure jet grouting and curtain grouting was determined. The dam body adopts high-pressure jet grouting. The dam foundation adopts curtain grouting，and the two form a full-section anti-seepage. The specific construction parameters of the anti-seepage treatment scheme are also pro⁃ posed. Through the inspection of the anti-seepage effect of the acid reservoir dam body and dam foundation after treatment，it can be known that the plan has achieved a good anti-seepage effect. This kind of technolo⁃ gy has certain reference value in the anti-seepage treatment of similar acid reservoirs.

Key words: high-pressure jet grouting, curtain grouting, anti-seepage treatment