The HAL portal of CY Cergy Paris Université is an open archive which: collects, preserves, promotes and spreads the scientific production of researchers from the University. Its main objectives are: promote access to laboratories publications; constitute an open scientific reference base for the community of researchers, teachers and practitioners; identify and highlight the scientific production of the University. The CY HAL portal is associated in a global movement in favor of open access to scientific research results. It follows the recommendations of the National Plan for Open Science.