Membranes have been widely used for water purification, gas separation, biomedical and biological applications, energy recovery, and fuel cells. However, the working conditions for the membranes could be incredible harsh and challenging. Metal membranes offer significant advantages over polymeric and ceramic membranes. In this work, various metal membranes with unique porous structure and surface properties will be developed and characterised. Their performances for different applications will be tested. New insight into further improvement in membranes will be elaborated.