This document outlines a GIS-based solution for city gas distribution networks presented by Reza Nourjou. It discusses the basic stages of city gas distribution networks and the advantages of using GIS technology at each stage, including better data management, analysis, and decision making. The document then describes the design and development of a GIS system called GasGIS for managing city gas distribution networks. It provides examples of how GasGIS can be used for tasks like marketing, network design, demand allocation, hydraulic calculations, reliability evaluation, project workflow management, and emergency response. The conclusion emphasizes that a GIS-based approach can help reduce costs, reduce time, and increase efficiency for city gas distribution projects through improved data handling and decision support