Abstract: Ecological restoration has widely been considered as an effective approach for mitigating ecological degradation and improving ecosystem function. Environmental effects evaluation on ecological restoration including measuring the ecological restoration extent of damaged ecosystem is one of the important branches of restoration ecology. Scientific, objective and accurate assessment of ecological restoration effects not only was essential element of ecological restoration, but also could provide important guidance to the further implementation of ecological restoration. The “Two River Nature Reserve” in the Altai Mountains is located at the southern slope of the Altai Mountains. This ecoregion is characterized by mountains dissected by river valleys, high levels of precipitation, and high biodiversity. The climate condition of this region is characterized by long cold winters, and short, cool summers. Irrational gold mining activities in this area have caused serious ecosystem degradation and led to the overall degradation or even the loss of ecological functions． To remediate the deteriorating ecological environment and further the restoration and reconstruction of damaged ecosystems，our country has ratified and implemented a large number of ecological restoration projects，which play an important role in curbing the current trend towards ecological degradation，and in guaranteeing the ecological security of the region．In this paper, an abandoned gold mining field in Altai Mountain, Xinjiang was selected as study area. 11 kinds of restoration measures taken by “Two river Nature Reserve Administration” from 2010 to 2015 were examined by calculating the  richness index, dominance index, diversity index, evenness index, biomass, vegetation coverage, species number and soil-rock ratio index. Further, the Principal Component Analysis (PCA) was used to compare the efficiency of each artificial measure. The results show that the effects of the single restoration measures, such as leveling, flock, mud and so on was not ideal; The combination of various measures can only improve the soil environment, but also lead to the change of plant community diversity, and the ecological restoration benefits are very good; As far as the same kind of restoration measure is considered, the longer restoration period the better recovery effect. According to a systematic summary of the study progress on effects evaluation of ecological restoration in an abandoned gold mining field in Altai Mountain, this paper supplies a brief account of effects evaluation from the aspects of its content, approach, method and technology.

Key words: Abandoned gold mine, artificial restoration, effects, Principal Component Analysis, Altai Mountain