This paper tries to give an overview on technologies using fibrous materials for contributing to environmental and resource matters. The technologies for water treatment include bio-reactive treatment system using membrane hollow fibre, desalination using Ro hollow fibre, purification of water work using UF or MF hollow fibre, purification of recycled water using photo-catalyst fibre, and oil removal systems using micro-fibre nonwoven. Removal system for incineration dust using bag filter, and removal system for toxic gas and solvent recovery using activated carbon fibre are typical examples for air cleaning. Fibrous materials are also effectively utilized for saving and production of energy and resources. Their application examples are electrode and separator for battery, and composite reinforcements for high pressure CNG vessel and wind turbine blade. The lightening transport vehicles using fibre reinforced composites have now become a big issue.