The present investigation was designed to determin of residual of petroleum hydrocarbons in seawater and sediments from Aden coasts, Yemeni, during April 2004. Additional hydrographic data such as air and water temperatures, salinity, dissolved oxygen, pH and total alkalinity were also determinated in order to give a better appraisal of survey data. The mean concentrations of residual petroleum hydrocarbons in seawater were varied from 19ng/ l at Al-OmalIsland to 239ng/l at free area and in sediment from 9ng/g at Al-OmalIsland to 45 infront of refinery.  The study revealed comparable level of petroleum hydrocarbons in this region to that reported for other parts of the world, which showed no pollution with petroleum hydrocarbons