Emergy is an alternative measure of value, based on real contributions to system performance, it is a new concept which quantifies “energy memory” in pro ducts and process. It is a new accounting unit of total contributions, direct and indirect, used in generation of a product or service. An emergy analysis of Tibetan system of economy and nature was performed in order to study its sustainability and emergy use. Indices of thermodynamic and economic vitality of Tibet were evaluated and a comparison with indices of other developed and developing countries or areas was performed.