Abstract: Sulfide is contained in the waste rock in abandoned acid tailing land,sulfuric acid is produced under the leaching of rainwater,acidification of the abandoned land is intensified,the enterprise environmental protection cost is improved.The acidification can be controlled fundamentally by ecological restoration work.According to the acidification mechanism of abandoned tailing land,combined with the latest study progress at home and abroad,the study status of ecological restoration is analyzed,the adaptability and advantages and disadvantages of the methods such as isolate coverage,improver modification,phytoremediation and microbial technique are discussed.Besides that,the application examples of the isolation coverage and phytoremediation technique and in—situ improvement and phytoremediation technique in Reden Coal Mine and Yongping Copper Mine are discussed.According to the characteristics of the abandoned acid tailing land,it is show that the shortcomings of the single methods is obvious,it is necessary to take integrated method to deal with the abandoned acid tailing land,isolation coverage and phytoremediation technique and in—situ improvement and phytoremediation technique can taken as the main study directions due to characteristics of less time consuming ,good effects and simple operation.

Key words: Abandoned acid tailing land, Ecological restoration, Isolation coverage, In—situ improvement