NOTWITHSTANDING WATER RESOURCE DEFICIENCY IN Hamedan, UNFORTUNATELY, WATER USAGE IN THE AGRICULTURE SECTOR IS UNSUSTAINABLE. ATTENTION TO ROLE AGRICULTURAL SECTOR IN province AND RURAL ECONOMY, THIS RESEARCH GOING TO EXPLAIN THE AGRICULTURAL WATER RESOURCE UNSUSTAINABILITY IN THE province. THIS RESEARCH WAS APPLIED AND DESCRIPTIVE RESEARCH THAT SECONDARY RESOURCE AND DATA SUCH AS GOVERNMENTAL DATA, ELECTRONIC SOURCE, BOOK AND ARTICLES WERE USED. RESULTS SHOW THAT ON THE BASES OF QUANTITY WATER RESOURCE IS UNSUSTAINABLE AND HAS 308 MILLION M3 SURPLUS EXTRACTIONS. ON THE BASIS OF MANNER OF EXPLOITATION, 80% OF WATER USAGE THROUGH GROUND WATER AND 20% FROM SURFACE WATER. WATER USAGE EFFICIENCY IN THE AGRICULTURE SECTOR IS 30%. SCILICET, WE LOSE 70% OF WATER IN THE AGRICULTURAL SECTOR. THE FINDING OF THIS STUDY COULD CONTRIBUTE TO DEVELOPMENT RELATED ORGANIZATIONS AND INSTITUTIONS, INTERESTED RESEARCHERS AND PRACTITIONERS AS WELL AS NATIONAL AND INTERNATIONAL DEVELOPMENT PLANNER AND POLICY MAKERS.