The present invention relates to a system and method for quantifying the extent of restoration of a watershed ecosystem using a geographic information system, and to grasp the current state of the ecological restoration site in the watershed, as well as to diagnose the performance according to the ecological restoration and to follow up the restoration direction. It is aimed at data construction and modeling.;The present invention is a system for quantifying the extent of restoration of a watershed ecosystem using a geographic information system, and geographic information for which data including the shape information 11 and attribute information (water quality, ecosystem and landscape) of the watershed are constructed through the geographic information system. A database 10; A server 20 for storing reference data of the attribution information of the watershed and a score for the reference data, and comparing the information constructed in the geographic information database with the reference data and assigning a score and constructing statistical data; The user computer 30 includes a program installed to update the watershed information in the geographic information database and to check the statistical data provided by the server.;GIS, Geographic Information System, Ecosystem, Restoration, Metering, Watershed
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