Abstract: Mine ecologic virescence project is crucial for mitigating conflict between mineral resource extraction and environmental protection, and evaluating its ecological benefits is a key aspect of measuring effectiveness of ecological restoration．Taking Mengte abandoned opencast mine in Nanmugou, Chongqing High-tech Industrial Development Zone as research object, concept of "Nature-based Solutions（NbS） was introduced to compare and analyze ecological benefits change characteristics of mining area before and after implementation of ecologic virescence project based on four dimensions, conserving water resources, maintaining water and soil conservation, purifying environment, and purifying water quality．Results showed that ecologic virescence project significantly optimized land use structure of mining area, with a decrease in proportion of industrial, mining and storage land in mining area, and an increase in proportion of water area, cultivated land, forest land, and garden land．Specifically, area of industrial, mining and storage land has been transferred out of 50.24 hm², while areas of water area, cultivated land, garden land, and forest land have been transferred into 14.04, 11.32, 9.29, and 13.28 hm²．Ecological service benefits of different land-use types in mining areas vary greatly．Ecological value of water area accounts for the highest proportion, which is mainly manifested in benefits of water conservation, followed by forest land, garden land, and cultivated land．Total value of ecological benefits after mine ecologic virescence was 41.2 million yuan/a．Among them, benefits of water conservation was 41.1 million yuan/a, followed by benefits of purifying water quality, purifying environment, and maintaining soil．Through implementation of ecologic virescence project featuring natural restoration as main approach, supplemented by artificial restoration, ecological benefits of abandoned opencast limestone mine in Nanmugou in terms of conserving water resources, maintaining water and soil conservation, purifying environment, and purifying water quality have been significantly enhanced, effectively protecting ecological environment of mining area to provide a reference for environmental governance and land reclamation in similar mining areas．