Abstract: The development of mineral resources caused a series of environmental problems and has restricted the sustainable development of mining cities. The monitoring of environmental disturbances in mining areas has become an important part of the construction of urban ecological civilization in mining areas. In order to study the impact of mining activities and ecological restoration of the mining area on the ecological environment of Qian'an City， this paper uses the Landsat series of remote sensing data from 2000 to 2018 to monitor the ecological disturbance in the mining area of Qian'an City. Random forest （RF） algorithm was used to extract and study the evolution of mining areas in Qian'an City from 2000 to 2018， and a remote sensing ecological index （RSEI） was constructed to quantitatively analyze the ecological environment quality and change characteristics of the study area. Studies show that from 2000 to 2018， the scope of the mining area in Qian'an has changed significantly， the total area of the mining area is significantly less and there are completely restored mining areas； the ecological environment quality of Qian'an City has a fluctuating downward trend， and the changes have a strong correlation with mining activities and ecological restoration in mining areas； combined with the spatial and temporal distribution of RSEI and ecological restoration activities in the mining area， the ecological environment changes in Qian'an City can be divided into two stages:① from 2000 to 2008， the ecological environment quality mainly changed from excellent， good to medium and poor， the areas with improved and deteriorated ecological quality accounted for 20.19% and 34.31% respectively.；② from 2008 to 2018， the overall ecological environment quality has increased， and the area of ecological quality improvement has reached 43.11%， and the changes are obviously regional.During the study period （from 2008 to 2018）， the ecological environment of Qian'an City experienced a process of first deterioration and then gradual recovery. It shows that Qian’an City has implemented functional zoning， perfected mineral resource planning and mining area zoning governance policies， the ecological environment has been improved， and the effect of ecological restoration is significant， providing a scientific basis for urban ecological governance in mining areas.

Key words: ecological restoration, ecological disturbance in mining area, remote sensing ecological index, environmental quality, principal component analysis