This research aimed at understanding legal aspect of environment polution resulted in oil spilled by Pertamina Unit PengolahaN III Plaju at Musi River. The result of research proved that large and small oil spilled often happened at Musi and Komering river. The main sources of oil spilled were oil catcher or separator and others. Legal aspect of oil spilled preventation done by Pertamina was to use nonpenal system. stressing at pre-emptive, preventif, represive, and rehabilitative, or formula NP=P2R2