Abstract: - Membrane technology is turning into the world's fundamental interest for enterprises because of its helpful and viable capacity for real life issues. It has numerous focal points, including selectivity, sensitivity, simplicity, easy fabrication, modest worth, high efficiency, economical and magnificent permeability. Membrane technology is being used in various disciplines for separation and identification processes. This study focuses on membrane types, functions and advantages especially on the application of polymeric membranes in CO2 separation and sequestration, because, carbon emission in environment is the major contributor towards climate change and global warming. Polymeric membrane efficiently can separate the CO2 from flue gas streams of combustion system which make it easy for capturing, dumping storage or utilization.Keywords: Membrane Technology, Polymeric Membrane, CO2 Separation