This book is written on the base on Comprehensive disaster management plan by UNDP. Community based environmental risk assessment approach is applied for risk mapping of the union. Opinion of the community people are integrated here with the comprehensive plan. This book highlights the individual hazard risk of an area, which mainly noted from the various key person and primary stakeholders of the area. Data sources are very reliable and data collection process was entirely field base. Scientific methodology applied for the analysis and research designing in this book. Vulnerability of different community are calculated precisely by scientific method. GPS is used for the geographical location and measure for the Hazard extent. A detailed Social map is shown in terms of showing the community. A detailed hazard map is showing where the hazard extent and hazard level are showed precisely. Finally the Risk map showing the risk level and risk extent of the community. Arcview GIS, ArcGIS, Google Earth are used for the mapping. Wholly this book will described Community based risk assessment is that fruitful and effective system of disaster risk assessment.